Responses were accepted at any time until the due date for completion of the next scheduled questionnaire.
Primary reasons for attrition included students not attending scheduled questionnaire administration, school transfers and student/parent withdrawal of consent.
During the data collection, some patients skipped single items, some returned a scheduled questionnaire later than requested, some stopped answering the questionnaires, and some died during follow-up.
Reminder emails can be triggered to patients who do not complete scheduled questionnaires.
For complex interventions, pre-specified information is likely to include participants' anticipated time commitment, interview schedules, questionnaires and so on.
Missed questionnaires were common during the six-week follow-up period, with the average subject completing 12.7 ± 5.1 questionnaires, out of a total of 20 scheduled questionnaires.
Methods: weekly schedule and questionnaire of our own design.
Medication adherence was assessed by the Medication Adherence Report Schedule (MARS) questionnaire [ 34].
In the late sixties Harold Dupuy, psychologist at the National Center for Health Statistics, developed his Psychological General Well Being Schedule, a questionnaire of 68 items to measure the degree of 'happiness' of the American population or the potential psychological distress.
Methodologically, conducting subgroup analysis, that is, for different intervention models, was not considered viable due to the strong association between type of approach and methodology used for example, Open Dialogue with case studies and Behavioural Family Therapy with the Family Intervention Schedule (FIS) questionnaire.
