Transcutaneous Electrical Nerve Stimulation for Endometriosis-related Chronic Pain

Pain intensity according to numeric rating scale (score from 0 to 10, where 0 is described as "no pain" and 10 as "worst pain imaginable") with regard to endometriosis-related chronic pain

Pain intensity according to numeric rating scale (score from 0 to 10, where 0 is described as "no pain" and 10 as "worst pain imaginable") with regard to endometriosis-related chronic pain

Minutes of physical activity per week at moderate and vigorous intensity physical activity (MVPA), minutes of sedentary behaviour (SED) assessed by accelerometry

Minutes of physical activity per week (physical exercise and daily exercise) and minutes of sedentary behaviour per week.

Consumption of primary and secondary analgetics including opioid consumption in morphine equivalent doses

Consumption of primary and secondary analgetics including opioid consumption in morphine equivalent doses

Pain intensity according to numeric rating scale (score from 0 to 10, where 0 is described as "no pain" and 10 as "worst pain imaginable") with regard to endometriosis-related chronic pain, Likert scale (1= "worse," 2= "unchanged," 3= "slightly improved," 4= "much improved," 5 = "very much improved,"and 6= "completely improved").

Pain intensity according to numeric rating scale (score from 0 to 10, where 0 is described as "no pain" and 10 as "worst pain imaginable") with regard to endometriosis-related chronic pain, Likert scale (1= "worse," 2= "unchanged," 3= "slightly improved," 4= "much improved," 5 = "very much improved,"and 6= "completely improved").

Assessed with RAND Short Form 36 (SF36). The 36 items in the questionnaire are grouped into eight subscale scores: physical functioning, role limitations caused by physical problems, bodily pain, general health, energy/vitality, social functioning, role limitations caused by emotional problems and mental health. The subscale scores range from 0-100, the higher score, the better health related quality of life.

Assessed with RAND Short Form 36 (SF36). The 36 items in the questionnaire are grouped into eight subscale scores: physical functioning, role limitations caused by physical problems, bodily pain, general health, energy/vitality, social functioning, role limitations caused by emotional problems and mental health. The subscale scores range from 0-100, the higher score, the better health related quality of life.

Assessed with EQ-5D-5L. The questionnaire comprises five dimensions: mobility, self-care, usual activities, pain/discomfort and anxiety/depression. Each dimension has 5 levels: no problems, slight problems, moderate problems, severe problems and extreme problems. The patient is asked to indicate his/her health state by ticking the box next to the most appropriate statement in each of the five dimensions. This decision results in a 1-digit number that expresses the level selected for that dimension. The digits for the five dimensions can be combined into a 5-digit number that describes the patient's health state.

The EQ VAS records the patient's self-rated health on a vertical visual analogue scale, where the endpoints are labelled 'The best health you can imagine' and 'The worst health you can imagine'. The VAS can be used as a quantitative measure of health outcome that reflect the patient's own judgement.

Assessed with EQ-5D-5L. The questionnaire comprises five dimensions: mobility, self-care, usual activities, pain/discomfort and anxiety/depression. Each dimension has 5 levels: no problems, slight problems, moderate problems, severe problems and extreme problems. The patient is asked to indicate his/her health state by ticking the box next to the most appropriate statement in each of the five dimensions. This decision results in a 1-digit number that expresses the level selected for that dimension. The digits for the five dimensions can be combined into a 5-digit number that describes the patient's health state.

The EQ VAS records the patient's self-rated health on a vertical visual analogue scale, where the endpoints are labelled 'The best health you can imagine' and 'The worst health you can imagine'. The VAS can be used as a quantitative measure of health outcome that reflect the patient's own judgement.

Assessed with Endometriosis Health Profile 30. The EHP score indicate the extent of self-reported ill health on each of the 5 domains measured (Pain, Control and powerlessness, Social support, Emotional well-being, Self-image). Each scale is standardised on a scale of 0 - 100, where 0 indicates the best health status through to 100 worst health status.

Assessed with Endometriosis Health Profile 30. The EHP score indicate the extent of self-reported ill health on each of the 5 domains measured (Pain, Control and powerlessness, Social support, Emotional well-being, Self-image). Each scale is standardised on a scale of 0 - 100, where 0 indicates the best health status through to 100 worst health status.

The General Self-Efficacy Scale is a 10-item psychometric scale that is designed to assess optimistic self-beliefs to cope with a variety of difficult demands in life, Likert scale (1= Not at all true 2= Hardly true 3= Moderately true 4= Exactly true)

The General Self-Efficacy Scale is a 10-item psychometric scale that is designed to assess optimistic self-beliefs to cope with a variety of difficult demands in life, Likert scale (1= Not at all true 2= Hardly true 3= Moderately true 4= Exactly true)

Total score from the 7-item Insomnia Severity Index where total score ranges from 0-28 and higher scores indicate greater severity of insomnia.

Total score from the 7-item Insomnia Severity Index where total score ranges from 0-28 and higher scores indicate greater severity of insomnia.

Number of days of sick-leave

Number of days of sick-leave

Assessed with the Hospital Anxiety and Depression (HAD) scale. The scale consists of 14 items on a four-point response scale ranging from 0-3. Seven items for depression and 7 items for anxiety with a score range from 0-21. For each factor (anxiety or depression), the results are interpreted as follows: < 8 points indicates within normal range, 8-10 points indicates possible and >10 points indicates probable anxiety or depression.

Assessed with the Hospital Anxiety and Depression (HAD) scale. The scale consists of 14 items on a four-point response scale ranging from 0-3. Seven items for depression and 7 items for anxiety with a score range from 0-21. For each factor (anxiety or depression), the results are interpreted as follows: < 8 points indicates within normal range, 8-10 points indicates possible and >10 points indicates probable anxiety or depression.

Self-reported treatment satisfaction with regard to pain relief, how acceptable the patient finds the treatment and hospital care. Numeric rating scale (score from 0 to 10, where 0 is described as "not satisfied at all" and 10 as "very satisfied") and numeric rating scale (score from 0 to 10, where 0 is described as "not acceptable at all" and 10 as "very acceptable").

Self-reported treatment satisfaction with regard to pain relief, how acceptable the patient finds the treatment and hospital care. Numeric rating scale (score from 0 to 10, where 0 is described as "not satisfied at all" and 10 as "very satisfied") and numeric rating scale (score from 0 to 10, where 0 is described as "not acceptable at all" and 10 as "very acceptable").

The Multidimensional Assessment of Interoceptive Awareness (MAIA) is an 8-scale state-trait questionnaire with 32 items to measure multiple dimensions of interoception by self-report.

The Multidimensional Assessment of Interoceptive Awareness (MAIA) is an 8-scale state-trait questionnaire with 32 items to measure multiple dimensions of interoception by self-report.

Number of patients who return to work part time or full time.

Number of patients who return to work part time or full time.