Remote Guided Caffeine Reduction

To determine to what extent participants will engage with a remote caffeine reduction intervention for caffeine-related problems and find it acceptable, we will calculate the percentage of completed assessments for each video visit among eligible participants.

At the 7 Weeks Follow-Up video visit, we will use an internally-developed standardized treatment acceptability questionnaire to determine self-reported agreement with two items on the treatment acceptability survey (i.e., "Overall, was the Guide to Caffeine Reduction and Cessation easy to use?", and "Overall, was the guide to Caffeine reduction and Cessation helpful?"). Each question is scored on a scale from 0-3, for a total score range of 0-6, where lower scores indicate less acceptability (e.g., 0=not at all easy, not at all helpful; 3 = very easy, very helpful).

To determine to what extent participants are successfully able to reduce their caffeine consumption following the remote intervention, we will assess caffeine consumption as determined by the standardized caffeine assessments at 7 week post-treatment follow-ups and compare this with consumption at the screening televisit. Based on participant responses to the number, type, and amount of caffeinated beverages, caffeine consumption is calculated at each assessment in milligrams (mg).

To determine to what extent participants report improvement in common caffeine-related problems following the remote intervention, we have developed a standardized 19-Item Caffeine Use Disorder measure of the extent to which common problems related to excessive caffeine consumption bothered participants within the past 7 days, e.g., "During the past 7 days, I have consumed caffeine in larger amounts or over a longer period than I intended." Participants rate the extent to which these problems bothered them on a scale from 0-3 where 0 = not at all a problem and 3 = major problem. The total possible scale range is from 0-57 (because the scores of 0-3 are summed for the 19 items). Higher sum scores on the measure indicate greater caffeine-related problems.

To determine whether caffeine reduction is accompanied by a reduction in day-to-day anxiety, we will utilize the Patient-Reported Outcomes Measurement Information System (PROMIS) Anxiety 8a assessment. The questionnaire asks the extent to which anxiety-related items affected the participants over the past 7 days on a scale of 1 (never) to 5 (always) with a total raw score range of 8-40 in which higher scores reflect greater anxiety. Raw scores are then translated into a standardized T-score with a mean of 50 and a standard deviation (SD) of 10. A higher PROMIS T-score represents more of the concept being measured. For negatively-worded concepts like anxiety, a T-score of 60 is one SD worse than average. By comparison, an anxiety T-score of 40 is one SD better than average. A score of less than 55 is none to slight, 55.0-59.9 is mild, 60.0-69.9 is moderate, and 70 and over is severe.

To determine whether caffeine reduction is accompanied by a reduction in day-to-day anxiety, we will utilize the Generalized Anxiety Disorder-7 (GAD-7). The GAD-7 consists of items asking the participant to rate on a scale of 0 (not at all) to 3 (nearly every day) the extent they have experienced anxiety related symptoms. The scoring range is 0-21 and higher scores indicate greater anxiety related symptoms.

To determine whether caffeine reduction is accompanied by a reduction in sleep problems, we will utilize the PROMIS Sleep Disturbance 8a assessment. The questionnaire asks the extent to which sleep-related items affected the participants over the past 7 days on a scale of 1 (not at all) to 5 (very much). The raw scoring range is 8-40 and higher scores reflect greater sleep disturbance. Raw scores are then translated into a standardized T-score with a mean of 50 and a standard deviation (SD) of 10. A higher PROMIS T-score represents more of the concept being measured. For negatively-worded concepts like sleep disturbance, a T-score of 60 is one SD worse than average. By comparison, T-score of 40 is one SD better than average. A T-score of 50 or above is often considered a clinically significant level of sleep disturbance.

To determine whether caffeine reduction is accompanied by a reduction in sleep problems, we will utilize the Pittsburgh Sleep Quality Index (PSQI), which contains 19 self-rated items and 7 sub-scales for different components where a score of 0 indicates no difficulty and a score of 3 indicates severe difficulty. The scoring range is 0-21 and higher global scores indicate greater sleep difficulties.

To determine whether caffeine reduction is accompanied by a reduction in gastrointestinal problems, we will utilize the PROMIS Reflux-13a. These items ask the extent to which gastrointestinal-related items affected the participants over the past 7 days on a scale of 1 (never) to 5 (always). The scoring range of raw scores is 13-65 and higher scores reflect greater gastrointestinal problems. Raw scores are then translated into a standardized T-score with a mean of 50 and a standard deviation (SD) of 10. A higher PROMIS T-score represents more of the concept being measured. For negatively-worded concepts like reflux, a T-score of 60 is one SD worse than average. By comparison, an anxiety T-score of 40 is one SD better than average.

To determine whether caffeine reduction is accompanied by a reduction in gastrointestinal problems, we will utilize the Gastrointestinal Symptoms Rating Scale (GSRS) which consists of 15 items describing gastrointestinal distress where responses range from 0 (no discomfort at all) to 6 (very severe discomfort). The scoring range is 0-90 and higher scores indicate more severe gastrointestinal symptoms.

To determine whether caffeine reduction is accompanied by a reduction in gastrointestinal problems, we will utilize the PROMIS Diarrhea-6a. These items ask the extent to which gastrointestinal-related items affected the participants over the past 7 days on a scale of 1 (never) to 5 (always). The raw scoring range is 6-30 and higher scores reflect greater gastrointestinal problems. Raw scores are then translated into a standardized T-score with a mean of 50 and a standard deviation (SD) of 10. A higher PROMIS T-score represents more of the concept being measured. For negatively-worded concepts like diarrhea, a T-score of 60 is one SD worse than average. By comparison, an anxiety T-score of 40 is one SD better than average.