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Using a temporally lagged design, one hundred and seventy-two respondents answered four questionnaires over a period of 14 months.
The teenagers, numbering over 375,000, filled out a number of questionnaires over a few days, which assessed, among other things, personality traits.
Self-reports were available for this sample from four questionnaires over a 9 year follow-up period.
Patients who agreed to participate in the follow-up study were mailed repetitive questionnaires over a period of at least 3 years.
Incident diabetes was assessed at five follow-up clinic visits and by four mailed questionnaires over a maximum 15-year follow-up period.
Adults aged ≥ 18 years diagnosed with gout or prescribed colchicine or allopurinol in the preceding 2 years will be identified through Read codes and mailed a series of self-completion postal questionnaires over a 3-year period.
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Researchers gathered health and lifestyle data at the start of the study, and the women reported their health in yearly questionnaires over an average 12 years of follow-up.
All members of the staff were asked to fill the questionnaire over a one-week period.
Using systematic random sampling, data were collected by previously used headache questionnaire, over a period of 20 days.
All hospital staff (n = 6,981) were eligible to complete a questionnaire over a 30-day period.
This process resulted in progressive refinement of the questionnaire over a period of five months.
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