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At the questionnaire development stage, objective, observable, or easy questions that do not call for judgments by proxies are preferred.
He was sitting in Dupont Circle in Washington, D.C., looking at the questionnaire on his phone.
For the outcomes reported, missing values at the questionnaire level were not imputed.
Missing self reported data could occur at the questionnaire level or at the item or scale level.
As a result, individuals entered the analysis at the questionnaire cycle in which they completed their first FFQ.
Information on smoking was obtained at the questionnaire interview, with women categorised as having smoked cigarettes at any stage of their pregnancy or not.
Similar(42)
Apart from the low response rates at the follow-up questionnaires this was due to the fact that students could choose to be seen anonymously, and at the questionnaires only a few identifying questions were asked (not their name).
At T2 the questionnaire was shortened and we sent two reminders following the initial distribution.
At T0, the questionnaire had items on marital and smoking status.
At baseline, the questionnaires were collected at the hospital.
Three-item screening questions of the ID Migraine™ test were included at the end of the questionnaire aimed at migraine diagnosis.
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