Patient- and Caregiver-reported Symptoms and Outcomes With Levodopa/Carbidopa Intestinal Gel for the Treatment of Advanced Parkinson's Disease

The PDQ-39 contains 39 items: mobility (items 1-10), activities of daily living (items 11-16), emotional well-being (items 17-22), stigma (items 23-26), social support (items 27-29), cognitions (items 30-33), communication (items 34-36), and bodily discomfort (items 37-39). Participants are asked to indicate the frequency of each event by selecting one of 5 options (score 0 to 4 on a Likert scale). The global score was calculated by expressing summed item scores as a percentage score ranging between 0 and 100. The lower scores indicate a better perceived health status and higher scores are associated with more health problems.

The PDQ-39 contains 39 items grouped in 8 domains: mobility (items 1-10), activities of daily living (items 11-16), emotional well-being (items 17-22), stigma (items 23-26), social support (items 27-29), cognitions (items 30-33), communication (items 34-36), and bodily discomfort (items 37-39). Participants are asked to indicate the frequency of each event by selecting one of 5 options (Likert scale): never, occasionally, sometimes, often, always or cannot do at all, scoring 0, 1, 2, 3 or 4, respectively. The mobility domain score was calculated by expressing summed item scores as a percentage score ranging between 0 and 100. The lower scores indicate a better perceived health status and higher scores are associated with more health problems.

The PDQ-39 contains 39 items grouped in 8 domains: mobility (items 1-10), activities of daily living (items 11-16), emotional well-being (items 17-22), stigma (items 23-26), social support (items 27-29), cognitions (items 30-33), communication (items 34-36), and bodily discomfort (items 37-39). Participants are asked to indicate the frequency of each event by selecting one of 5 options (Likert scale): never, occasionally, sometimes, often, always or cannot do at all, scoring 0, 1, 2, 3 or 4, respectively. The activities of daily living domain score was calculated by expressing summed item scores as a percentage score ranging between 0 and 100. The lower scores indicate a better perceived health status and higher scores are associated with more health problems.

The PDQ-39 contains 39 items grouped in 8 domains: mobility (items 1-10), activities of daily living (items 11-16), emotional well-being (items 17-22), stigma (items 23-26), social support (items 27-29), cognitions (items 30-33), communication (items 34-36), and bodily discomfort (items 37-39). Participants are asked to indicate the frequency of each event by selecting one of 5 options (Likert scale): never, occasionally, sometimes, often, always or cannot do at all, scoring 0, 1, 2, 3 or 4, respectively. The emotional well-being domain score was calculated by expressing summed item scores as a percentage score ranging between 0 and 100. The lower scores indicate a better perceived health status and higher scores are associated with more health problems.

The PDQ-39 contains 39 items grouped in 8 domains: mobility (items 1-10), activities of daily living (items 11-16), emotional well-being (items 17-22), stigma (items 23-26), social support (items 27-29), cognitions (items 30-33), communication (items 34-36), and bodily discomfort (items 37-39). Participants are asked to indicate the frequency of each event by selecting one of 5 options (Likert scale): never, occasionally, sometimes, often, always or cannot do at all, scoring 0, 1, 2, 3 or 4, respectively. The stigma domain score was calculated by expressing summed item scores as a percentage score ranging between 0 and 100. The lower scores indicate a better perceived health status and higher scores are associated with more health problems.

The PDQ-39 contains 39 items grouped in 8 domains: mobility (items 1-10), activities of daily living (items 11-16), emotional well-being (items 17-22), stigma (items 23-26), social support (items 27-29), cognitions (items 30-33), communication (items 34-36), and bodily discomfort (items 37-39). Participants are asked to indicate the frequency of each event by selecting one of 5 options (Likert scale): never, occasionally, sometimes, often, always or cannot do at all, scoring 0, 1, 2, 3 or 4, respectively. The social support domain score was calculated by expressing summed item scores as a percentage score ranging between 0 and 100. The lower scores indicate a better perceived health status and higher scores are associated with more health problems.

The PDQ-39 contains 39 items grouped in 8 domains: mobility (items 1-10), activities of daily living (items 11-16), emotional well-being (items 17-22), stigma (items 23-26), social support (items 27-29), cognitions (items 30-33), communication (items 34-36), and bodily discomfort (items 37-39). Participants are asked to indicate the frequency of each event by selecting one of 5 options (Likert scale): never, occasionally, sometimes, often, always or cannot do at all, scoring 0, 1, 2, 3 or 4, respectively. The cognition domain score was calculated by expressing summed item scores as a percentage score ranging between 0 and 100. The lower scores indicate a better perceived health status and higher scores are associated with more health problems.

The PDQ-39 contains 39 items grouped in 8 domains: mobility (items 1-10), activities of daily living (items 11-16), emotional well-being (items 17-22), stigma (items 23-26), social support (items 27-29), cognitions (items 30-33), communication (items 34-36), and bodily discomfort (items 37-39). Participants are asked to indicate the frequency of each event by selecting one of 5 options (Likert scale): never, occasionally, sometimes, often, always or cannot do at all, scoring 0, 1, 2, 3 or 4, respectively. The communication domain score was calculated by expressing summed item scores as a percentage score ranging between 0 and 100. The lower scores indicate a better perceived health status and higher scores are associated with more health problems.

The PDQ-39 contains 39 items grouped in 8 domains: mobility (items 1-10), activities of daily living (items 11-16), emotional well-being (items 17-22), stigma (items 23-26), social support (items 27-29), cognitions (items 30-33), communication (items 34-36), and bodily discomfort (items 37-39). Participants are asked to indicate the frequency of each event by selecting one of 5 options (Likert scale): never, occasionally, sometimes, often, always or cannot do at all, scoring 0, 1, 2, 3 or 4, respectively. The bodily discomfort domain score was calculated by expressing summed item scores as a percentage score ranging between 0 and 100. The lower scores indicate a better perceived health status and higher scores are associated with more health problems.

The UPDRS is an investigator-used rating tool to follow the longitudinal course of Parkinson's disease. The UPDRS-III was used in ON state. The motor examination contains 27 items. Each item is scored in a Likert scale from 0 to 4. The UPDRS-III score was calculated summing the score of each item, ranging from 0 to 108, with higher score indicating more impairment.

The NMSS measures the frequency and severity of a range of non-motor symptoms in Parkinson's Disease. It consists of 30 questions grouped into 9 domains: cardiovascular including falls (items 1-2), sleep/fatigue (items 3-6), mood/cognition (items 7-12), perceptual problems/hallucinations (items 13-15), attention/memory (items 16-18), gastrointestinal tract (items 19-21), urinary (items 22-24), sexual function (items 25-26), and miscellaneous (pain, taste/smell, weight change, excessive sweating; items 27-30). Severity is rated on a scale from 0 (none) to 3 (severe) and frequency is rated on a scale from 1 (rarely) to 4 (very frequent). The global score was calculated summing the score of each item (severity x frequency), ranging from 0 to 360, with a lower score indicating fewer symptoms. A negative change from baseline indicates improvement in symptoms.

The NMSS measures the frequency and severity of a range of non-motor symptoms in Parkinson's Disease. It consists of 30 questions grouped into 9 domains: cardiovascular including falls (items 1-2), sleep/fatigue (items 3-6), mood/cognition (items 7-12), perceptual problems/hallucinations (items 13-15), attention/memory (items 16-18), gastrointestinal tract (items 19-21), urinary (items 22-24), sexual function (items 25-26), and miscellaneous (pain, taste/smell, weight change, excessive sweating; items 27-30). Severity is rated on a scale from 0 (none) to 3 (severe) and frequency is rated on a scale from 1 (rarely) to 4 (very frequent). The cardiovascular domain score ranges from 0 to 24 with a lower score indicating fewer symptoms. A negative change from baseline indicates improvement in symptoms.

The NMSS measures the frequency and severity of a range of non-motor symptoms in Parkinson's Disease. It consists of 30 questions grouped into 9 domains: cardiovascular including falls (items 1-2), sleep/fatigue (items 3-6), mood/cognition (items 7-12), perceptual problems/hallucinations (items 13-15), attention/memory (items 16-18), gastrointestinal tract (items 19-21), urinary (items 22-24), sexual function (items 25-26), and miscellaneous (pain, taste/smell, weight change, excessive sweating; items 27-30). Severity is rated on a scale from 0 (none) to 3 (severe) and frequency is rated on a scale from 1 (rarely) to 4 (very frequent). The sleep/fatigue domain score ranges from 0 to 48 with a lower score indicating fewer symptoms. A negative change from baseline indicates improvement in symptoms.

The NMSS measures the frequency and severity of a range of non-motor symptoms in Parkinson's Disease. It consists of 30 questions grouped into 9 domains: cardiovascular including falls (items 1-2), sleep/fatigue (items 3-6), mood/cognition (items 7-12), perceptual problems/hallucinations (items 13-15), attention/memory (items 16-18), gastrointestinal tract (items 19-21), urinary (items 22-24), sexual function (items 25-26), and miscellaneous (pain, taste/smell, weight change, excessive sweating; items 27-30). Severity is rated on a scale from 0 (none) to 3 (severe) and frequency is rated on a scale from 1 (rarely) to 4 (very frequent). The mood/cognition domain score ranges from 0 to 72 with a lower score indicating fewer symptoms. A negative change from baseline indicates improvement in symptoms.

The NMSS measures the frequency and severity of a range of non-motor symptoms in Parkinson's Disease. It consists of 30 questions grouped into 9 domains: cardiovascular including falls (items 1-2), sleep/fatigue (items 3-6), mood/cognition (items 7-12), perceptual problems/hallucinations (items 13-15), attention/memory (items 16-18), gastrointestinal tract (items 19-21), urinary (items 22-24), sexual function (items 25-26), and miscellaneous (pain, taste/smell, weight change, excessive sweating; items 27-30). Severity is rated on a scale from 0 (none) to 3 (severe) and frequency is rated on a scale from 1 (rarely) to 4 (very frequent). The perceptual problems/hallucinations domain score ranges from 0 to 36 with a lower score indicating fewer symptoms. A negative change from baseline indicates improvement in symptoms.

The NMSS measures the frequency and severity of a range of non-motor symptoms in Parkinson's Disease. It consists of 30 questions grouped into 9 domains: cardiovascular including falls (items 1-2), sleep/fatigue (items 3-6), mood/cognition (items 7-12), perceptual problems/hallucinations (items 13-15), attention/memory (items 16-18), gastrointestinal tract (items 19-21), urinary (items 22-24), sexual function (items 25-26), and miscellaneous (pain, taste/smell, weight change, excessive sweating; items 27-30). Severity is rated on a scale from 0 (none) to 3 (severe) and frequency is rated on a scale from 1 (rarely) to 4 (very frequent). The attention/memory domain score ranges from 0 to 36 with a lower score indicating fewer symptoms. A negative change from baseline indicates improvement in symptoms.

The NMSS measures the frequency and severity of a range of non-motor symptoms in Parkinson's Disease. It consists of 30 questions grouped into 9 domains: cardiovascular including falls (items 1-2), sleep/fatigue (items 3-6), mood/cognition (items 7-12), perceptual problems/hallucinations (items 13-15), attention/memory (items 16-18), gastrointestinal tract (items 19-21), urinary (items 22-24), sexual function (items 25-26), and miscellaneous (pain, taste/smell, weight change, excessive sweating; items 27-30). Severity is rated on a scale from 0 (none) to 3 (severe) and frequency is rated on a scale from 1 (rarely) to 4 (very frequent). The gastrointestinal tract domain score ranges from 0 to 36 with a lower score indicating fewer symptoms; a negative change from baseline indicates improvement in symptoms.

The NMSS measures the frequency and severity of a range of non-motor symptoms in Parkinson's Disease. It consists of 30 questions grouped into 9 domains: cardiovascular including falls (items 1-2), sleep/fatigue (items 3-6), mood/cognition (items 7-12), perceptual problems/hallucinations (items 13-15), attention/memory (items 16-18), gastrointestinal tract (items 19-21), urinary (items 22-24), sexual function (items 25-26), and miscellaneous (pain, taste/smell, weight change, excessive sweating; items 27-30). Severity is rated on a scale from 0 (none) to 3 (severe) and frequency is rated on a scale from 1 (rarely) to 4 (very frequent). The urinary domain score ranges from 0 to 36 with a lower score indicating fewer symptoms.A negative change from baseline indicates improvement in symptoms.

The NMSS measures the frequency and severity of a range of non-motor symptoms in Parkinson's Disease. It consists of 30 questions grouped into 9 domains: cardiovascular including falls (items 1-2), sleep/fatigue (items 3-6), mood/cognition (items 7-12), perceptual problems/hallucinations (items 13-15), attention/memory (items 16-18), gastrointestinal tract (items 19-21), urinary (items 22-24), sexual function (items 25-26), and miscellaneous (pain, taste/smell, weight change, excessive sweating; items 27-30). Severity is rated on a scale from 0 (none) to 3 (severe) and frequency is rated on a scale from 1 (rarely) to 4 (very frequent). The sexual function domain score ranges from 0 to 24 with a lower score indicating fewer symptoms. A negative change from baseline indicates improvement in symptoms.

The NMSS measures the frequency and severity of a range of non-motor symptoms in Parkinson's Disease. It consists of 30 questions grouped into 9 domains: cardiovascular including falls (items 1-2), sleep/fatigue (items 3-6), mood/cognition (items 7-12), perceptual problems/hallucinations (items 13-15), attention/memory (items 16-18), gastrointestinal tract (items 19-21), urinary (items 22-24), sexual function (items 25-26), and miscellaneous (pain, taste/smell, weight change, excessive sweating; items 27-30). Severity is rated on a scale from 0 (none) to 3 (severe) and frequency is rated on a scale from 1 (rarely) to 4 (very frequent). The miscellaneous domain score ranges from 0 to 48 with a lower score indicating fewer symptoms. A negative change from baseline indicates improvement in symptoms.

The Norris/Bond-Lader VAS measures emotional well-being status with a 16-item visual analogue mood rating scale. The VAS consisted of 16 visual analogue items each representing opposite extremes of mood, with the following labels at each end: alert/drowsy, calm/excited, strong/weak, muzzy/clear-headed, well-coordinated/clumsy, lethargic/energetic, contented/dreamy, incompetent/proficient, happy/sad, antagonistic/amicable, interested/bored, withdrawn/gregarious. These scales loaded on 3 domains (alert, strong, clear-headed, well-coordinated, energetic, quick-witted, attentive, proficient, interested); (contented, tranquil, happy, amicable, gregarious); (calm, relaxed). For each individual scale, a line was drawn between each mood state and its opposite and participants rated their current mood by placing a vertical mark on the line. Scores (global, and for each domain) ranged from 0 to 100, with lower scores indicating more positive mood.

The Norris/Bond-Lader VAS measures emotional well-being status with a 16-item visual analogue mood rating scale. The VAS consisted of 16 visual analogue items each representing opposite extremes of mood, with the following labels at each end: alert/drowsy, calm/excited, strong/weak, muzzy/clear-headed, well-coordinated/clumsy, lethargic/energetic, contented/dreamy, incompetent/proficient, happy/sad, antagonistic/amicable, interested/bored, withdrawn/gregarious. These scales loaded on 3 domains (alert, strong, clear-headed, well-coordinated, energetic, quick-witted, attentive, proficient, interested); (contented, tranquil, happy, amicable, gregarious); (calm, relaxed). For each individual scale, a line was drawn between each mood state and its opposite and participants rated their current mood by placing a vertical mark on the line. Scores (global, and for each domain) ranged from 0 to 100, with lower scores indicating more positive mood.

The Norris/Bond-Lader VAS measures emotional well-being status with a 16-item visual analogue mood rating scale. The VAS consisted of 16 visual analogue items each representing opposite extremes of mood, with the following labels at each end: alert/drowsy, calm/excited, strong/weak, muzzy/clear-headed, well-coordinated/clumsy, lethargic/energetic, contented/dreamy, incompetent/proficient, happy/sad, antagonistic/amicable, interested/bored, withdrawn/gregarious. These scales loaded on 3 domains (alert, strong, clear-headed, well-coordinated, energetic, quick-witted, attentive, proficient, interested); (contented, tranquil, happy, amicable, gregarious); (calm, relaxed). For each individual scale, a line was drawn between each mood state and its opposite and participants rated their current mood by placing a vertical mark on the line. Scores (global, and for each domain) ranged from 0 to 100, with lower scores indicating more positive mood.

The Norris/Bond-Lader VAS measures emotional well-being status with a 16-item visual analogue mood rating scale. The VAS consisted of 16 visual analogue items each representing opposite extremes of mood, with the following labels at each end: alert/drowsy, calm/excited, strong/weak, muzzy/clear-headed, well-coordinated/clumsy, lethargic/energetic, contented/dreamy, incompetent/proficient, happy/sad, antagonistic/amicable, interested/bored, withdrawn/gregarious. These scales loaded on 3 domains (alert, strong, clear-headed, well-coordinated, energetic, quick-witted, attentive, proficient, interested); (contented, tranquil, happy, amicable, gregarious); (calm, relaxed). For each individual scale, a line was drawn between each mood state and its opposite and participants rated their current mood by placing a vertical mark on the line. Scores (global, and for each domain) ranged from 0 to 100, with lower scores indicating more positive mood.

The PFS-16 comprises 16 items with five polytomous response categories (strongly disagree, disagree, do not agree or disagree, agree, and strongly agree). Responses were scored from 0 (strongly disagree) to 4 (strongly agree), yielding a summed total score ranging from 0 (no fatigue) to 64 (most severe fatigue). The cut-point of ≥ 3.30 was used to identified those perceiving fatigue to be a problem.

The AS is an inventory of 14 questions that assess cognitive and behavioral symptoms of emotional apathy. Each is rated from 0 to 3 on a Likert scale. The total scores for AS ranges from 0 (no apathy) to 42 (most apathetic). AS scores ≥ 14 were considered apathetic.

The BDI-II is a 21-item self-report multiple-choice inventory. Items are rated on a 4-point scale ranging from 0 to 3 based on severity of each item. The maximum total score is 63. Raw scores from 0-13 indicates minimal depression, 14-19 indicates mild depression, 20-28 indicates moderate depression, and 29-63 indicates severe depression.

The BAI is a 21-item self-report multiple-choice inventory. Items are rated on a 4-point scale ranging from 0 to 3 based on severity of each item. The maximum total score is 63. Raw scores from 0-7 indicates minimal anxiety, 8-15 indicates mild anxiety, 16-25 indicates moderate anxiety, and 25-63 indicates severe anxiety.

The SATMED-Q is a 17-item questionnaire. Items are grouped in 6 domains: undesirable side effects (items 1-3), treatment effectiveness (items 4-6), convenience of use (items 7-9), impact on daily living activities (items 10-12), medical care (items 13-14), and global satisfaction (items 15-17). Items are rated on a 5-point scale ranging from 0 to 4. Summing up the direct scores of the items yields a total composite score ranging between 0 and 68, which was transformed to a minimum of 0 (most satisfied) and a maximum of 100 (least satisfied).

The SATMED-Q is a 17-item questionnaire. Items are grouped in 6 domains: undesirable side effects (items 1-3), treatment effectiveness (items 4-6), convenience of use (items 7-9), impact on daily living activities (items 10-12), medical care (items 13-14), and global satisfaction (items 15-17). Items are rated on a 4-point scale ranging from 0 to 4. Summing up the direct scores of the items yields a total undesirable side effects score ranging between 0 and 12, which was transformed to a minimum of 0 (most satisfied) and a maximum of 100 (least satisfied).

The SATMED-Q is a 17-item questionnaire. Items are grouped in 6 domains: undesirable side effects (items 1-3), treatment effectiveness (items 4-6), convenience of use (items 7-9), impact on daily living activities (items 10-12), medical care (items 13-14), and global satisfaction (items 15-17). Items are rated on a 4-point scale ranging from 0 to 4. Summing up the direct scores of the items yields a total treatment effectiveness score ranging between 0 and 12, which was transformed to a minimum of 0 (most satisfied) and a maximum of 100 (least satisfied).

The SATMED-Q is a 17-item questionnaire. Items are grouped in 6 domains: undesirable side effects (items 1-3), treatment effectiveness (items 4-6), convenience of use (items 7-9), impact on daily living activities (items 10-12), medical care (items 13-14), and global satisfaction (items 15-17). Items are rated on a 4-point scale ranging from 0 to 4. Summing up the direct scores of the items yields a total convenience of use score ranging between 0 and 12, which was transformed to a minimum of 0 (most satisfied) and a maximum of 100 (least satisfied).

The SATMED-Q is a 17-item questionnaire. Items are grouped in 6 domains: undesirable side effects (items 1-3), treatment effectiveness (items 4-6), convenience of use (items 7-9), impact on daily living activities (items 10-12), medical care (items 13-14), and global satisfaction (items 15-17). Items are rated on a 4-point scale ranging from 0 to 4. Summing up the direct scores of the items yields a total impact on daily living activities score ranging between 0 and 12, which was transformed to a minimum of 0 (most satisfied) and a maximum of 100 (least satisfied).

The SATMED-Q is a 17-item questionnaire. Items are grouped in 6 domains: undesirable side effects (items 1-3), treatment effectiveness (items 4-6), convenience of use (items 7-9), impact on daily living activities (items 10-12), medical care (items 13-14), and global satisfaction (items 15-17). Items are rated on a 4-point scale ranging from 0 to 4. Summing up the direct scores of the items yields a total medical care score ranging between 0 and 8, which was transformed to a minimum of 0 (most satisfied) and a maximum of 100 (least satisfied).

The SATMED-Q is a 17-item questionnaire. Items are grouped in 6 domains: undesirable side effects (items 1-3), treatment effectiveness (items 4-6), convenience of use (items 7-9), impact on daily living activities (items 10-12), medical care (items 13-14), and global satisfaction (items 15-17). Items are rated on a 4-point scale ranging from 0 to 4. Summing up the direct scores of the items yields a total global satisfaction score ranging between 0 and 12, which was transformed to a minimum of 0 (most satisfied) and a maximum of 100 (least satisfied).

The SQLC is designed to both qualitatively and quantitatively evaluate the impact of a patient's disease on the caregiver's quality of life. The SQLC questionnaire consists of 16 questions that evaluate 3 domains: professional activities (questions 1-4), social and leisure activities (questions 5-9), and caregiving responsibilities (questions 10-16). Composite scores range from 0 to 149, with higher scores indicating higher quality of life.

The SQLC is designed to both qualitatively and quantitatively evaluate the impact of a patient's disease on the caregiver's quality of life. The SQLC questionnaire consists of 16 questions that evaluate 3 domains: professional activities (questions 1-4), social and leisure activities (questions 5-9), and caregiving responsibilities (questions 10-16). Professional activities scores range from 0 to 38, with higher scores indicating higher quality of life.

The SQLC is designed to both qualitatively and quantitatively evaluate the impact of a patient's disease on the caregiver's quality of life. The SQLC questionnaire consists of 16 questions that evaluate 3 domains: professional activities (questions 1-4), social and leisure activities (questions 5-9), and caregiving responsibilities (questions 10-16). Social and leisure activities scores range from 0 to 58, with higher scores indicating higher quality of life.

The SQLC is designed to both qualitatively and quantitatively evaluate the impact of a patient's disease on the caregiver's quality of life. The SQLC questionnaire consists of 16 questions that evaluate 3 domains: professional activities (questions 1-4), social and leisure activities (questions 5-9), and caregiving responsibilities (questions 10-16). Caregiving responsibilities scores range from 0 to 53, with higher scores indicating higher quality of life.

The ZBI is a 22-item questionnaire in which caregivers must evaluate the level of agreement on a 5-point Likert scale from 0 to 4. The total score is obtained by the sum of the scores of the items. This total score represents a level of caregiver burden, with a range of 0 indicating no burden to 88 indicating completely overloaded.

The CSI is a 13-item questionnaire based on identified common stressors. Answers are in yes/no format. Scoring is 1 point for each "yes" and 0 for each "no". The total score is obtained by the sum of the scores of the items. Minimum score is 0 (no stress) and maximum score is 13 (most stress). A score ≥ 7 indicates a high level of stress.

The GADS is an 18-item self-report symptom inventory made up of two sub-scales, one for the detection of anxiety and another one for the detection of depression. Both sub-scales are composed of 9 questions. Answers are in yes/no format. Scoring is 1 point for each "yes" and 0 for each "no", with a total sub-scale score of 0 (no anxiety/depression) to 9 (worst anxiety/depression). In the Spanish validation of GADS, the cutoff point to consider probable anxiety disorder is 4 and 2 for probable depression.

The GADS is an 18-item self-report symptom inventory made up of two sub-scales, one for the detection of anxiety and another one for the detection of depression. Both sub-scales are composed of 9 questions. Answers are in yes/no format. Scoring is 1 point for each "yes" and 0 for each "no", with a total sub-scale score of 0 (no anxiety/depression) to 9 (worst anxiety/depression). In the Spanish validation of GADS, the cutoff point to consider probable anxiety disorder is 4 and 2 for probable depression.

Absenteeism, presented as the mean percentage of work time missed due to caregiving (as reported on the WPAI), and calculated as: 100*number of hours of work missed due to caregiving / (number of hours of work missed due to caregiving + number of hours worked). WPAI is a questionnaire used to evaluate lost productivity; scores are presented as percentages (multiplying the scores by 100), with 0% representing no impact on productivity and 100% representing complete impact on productivity.

Presenteeism (the extent to which caregiving decreased productivity) is presented as the mean percentage of impairment while working due to caregiving, and calculated as: 100*scale value of question 5 on the WPAI (between 0 and 10) / 10. WPAI is a questionnaire used to evaluate lost productivity; scores are presented as percentages (multiplying the scores by 100), with 0% representing no impact on productivity and 100% representing complete impact on productivity.

The mean percentage of OWPI due to caregiving (based on the WPAI questionnaire) is presented, calculated as: Absenteeism (%) + extent to which caregiving decreased productivity (%)* [number of hours worked / (number of hours of work missed due to caregiving + number of hours worked)]. WPAI is a questionnaire used to evaluate lost productivity; scores are presented as percentages (multiplying the scores by 100), with 0% representing no impact on productivity and 100% representing complete impact on productivity.

Activity impairment due to caregiving (the extent to which caregiving affected the ability to perform usual daily activities) is presented as the mean percentage of activity impairment, calculated as 100*scale value of WPAI question 6 (between 0 and 10) / 10. WPAI is a questionnaire used to evaluate lost productivity; scores are presented as percentages (multiplying the scores by 100), with 0% representing no impact on productivity/activity and 100% representing complete impact on productivity/activity.

Spearman correlation statistics were calculated for the quality of life of the participants (Global PDQ-39, see Outcome Measure 1) and the following scales: UPDRS-III (see Outcome Measure 10), UPDRS-IV (see description below), NMSS (see Outcome Measure 11), BAI (see Outcome Measure 28), BDI-III (see Outcome Measure 27), AS (see Outcome Measure 26), PFS (see Outcome Measure 25), Norris Bond-Lader (NBL) Alertness-Sedation (A-S; see Outcome Measure 22), NBL Contented-Discontented (C-D; see Outcome Measure 23), NBL Calm-Relaxed (C-R; see Outcome Measure 24), ZBI (see Outcome Measure 40), GADS-Anxiety (see Outcome Measure 43), and GADS-Depression (see Outcome Measure 42).

The UPDRS-IV contains 11 items, each scored in a Likert scale from 0 (normal) to 4 (severe); or a 2-point scale (yes/no format), with 1 point for "yes" and 0 for "no." The global score was calculated summing the score of each item, ranging from 0 to 23, where higher scores are associated with more disability.

Spearman correlation statistics were calculated for the quality of life of the participants (Global PDQ-39, see Outcome Measure 1) and the following scales: UPDRS-III (see Outcome Measure 10), UPDRS-IV (see description below), NMSS (see Outcome Measure 11), BAI (see Outcome Measure 28), BDI-III (see Outcome Measure 27), AS (see Outcome Measure 26), PFS (see Outcome Measure 25), Norris Bond-Lader (NBL) Alertness-Sedation (A-S; see Outcome Measure 22), NBL Contented-Discontented (C-D; see Outcome Measure 23), NBL Calm-Relaxed (C-R; see Outcome Measure 24), ZBI (see Outcome Measure 40), GADS-Anxiety (see Outcome Measure 43), and GADS-Depression (see Outcome Measure 42).

The UPDRS-IV contains 11 items, each scored in a Likert scale from 0 (normal) to 4 (severe); or a 2-point scale (yes/no format), with 1 point for "yes" and 0 for "no." The global score was calculated summing the score of each item, ranging from 0 to 23, where higher scores are associated with more disability.

Spearman correlation statistics were calculated for the quality of life of the caregivers (Global SQLC, see Outcome Measure ) and the following scales: ZBI (see Outcome Measure 40), GADS-Anxiety (see Outcome Measure 43), and GADS-Depression (see Outcome Measure 42), NBL A-S (see Outcome Measure 22), NBL C-D (see Outcome Measure 23), NBL C-R (see Outcome Measure 24), Global PDQ-39 (see Outcome Measure 1), UPDRS-III (see Outcome Measure 10), UPDRS-IV (see description below), and Global NMSS (see Outcome Measure 11).

The UPDRS-IV contains 11 items, each scored in a Likert scale from 0 (normal) to 4 (severe); or a 2-point scale (yes/no format), with 1 point for "yes" and 0 for "no." The global score was calculated summing the score of each item, ranging from 0 to 23, where higher scores are associated with more disability.

Spearman correlation statistics were calculated for the quality of life of the caregivers (Global SQLC, see Outcome Measure ) and the following scales: ZBI (see Outcome Measure 40), GADS-Anxiety (see Outcome Measure 43), and GADS-Depression (see Outcome Measure 42), NBL A-S (see Outcome Measure 22), NBL C-D (see Outcome Measure 23), NBL C-R (see Outcome Measure 24), Global PDQ-39 (see Outcome Measure 1), UPDRS-III (see Outcome Measure 10), UPDRS-IV (see description below), and Global NMSS (see Outcome Measure 11).

The UPDRS-IV contains 11 items, each scored in a Likert scale from 0 (normal) to 4 (severe); or a 2-point scale (yes/no format), with 1 point for "yes" and 0 for "no." The global score was calculated summing the score of each item, ranging from 0 to 23, where higher scores are associated with more disability.