The survey package included a cover letter, the randomly assigned questionnaire, a set of evaluation and patients' characteristics items, and a stamped return envelope.
Each of 32 classes in a private University in Maputo, Mozambique, was randomly assigned questionnaire A (233 participants) or B (276 participants).
Students assigned a set of drinking questionnaires at baseline, 3, 6 and 12 months reduced their AUDIT score and had lower peak blood alcohol content (BAC) levels at follow-up than controls, who were only assigned questionnaires at 12 months39.
To date the most rigorous examination of the validity of self-reported pregnancy outcome data was undertaken by Espeut in Bangladesh: comparing DSS data from Matlab, Bangladesh, matched to respondents in a DHS survey in which respondents were randomly assigned a questionnaire with a live birth or pregnancy history.
Individuals who answered all four questions positively and had symptoms at least 5 times per month were assigned a questionnaire-based RLS-diagnosis [ 22, 23].
Preference survey participants were randomly assigned to questionnaire version within treatment strata.
Through this module, it is possible to assign a questionnaire to one or more patients by specifying the examination elapse and the delivery recurrence.
The overall response rate was similar among persons randomly assigned to questionnaires (58.1%) and to telephone interviews (56.2%).
Overall, the response rates for the two modes of data collection were similar; 58.1% among persons randomly assigned to questionnaires and 56.2% among persons randomly assigned to telephone interviews (p = 0.26).
The data were anonymous and unlinked, as identification of study participants was through a code number assigned to each questionnaire.
*Women who reported PPI use on a biennial questionnaire were assigned a duration of use of 2 years, and this variable increased in biennial increments (thus women who reported PPI use on two biennial questionnaires were assigned a duration of use of 4 years, those who reported use on three questionnaires were assigned a duration of 6 years, etc).
