The EAI is the shortest psychometrically validated questionnaire to date.
18 19 20 Person time for participants was calculated from the date of return of their baseline questionnaires to the date of the diagnosis of ulcerative colitis or Crohn's disease, date of last returned questionnaire, or 1 June 2010 for the Nurses Health Studyy and 1 June 2009 for the Nurses Health Study III, whichever came first.
Median delay in response (from date questionnaire sent to date questionnaire returned) was 6 days (range 2 73 days) for case-patients and 7 days (range 1 77 days) for non-case-patients Kruskal-Wallis H 1.811, p=0.18).
These results may help researchers to select the most appropriate physical activity PRO questionnaires available to date, and will identify research gaps.
Person time for each participant was calculated from the date of return of the baseline questionnaire to the date of first hip fracture, date of last questionnaire report, death from any cause, or last day of outcome ascertainment (1 June 2008), whichever came first.
Person-time was calculated from the date of the 6-month questionnaire to the date of first brain tumor diagnosis, date of first any other tumor diagnosis, death from any cause, last contact, or end of follow-up, whatever occurred first.
We calculated person-years of follow-up for each participant from the date of return of the questionnaire to the date of type 2 diabetes, the date of death, or 1 January 2006.
25 We calculated each participant's person years from the return date of the baseline food frequency questionnaire to the date of the type 2 diabetes diagnosis, date of death, last return of a valid follow-up questionnaire, or end of follow-up (2008 for the Nurses Health Study and Health Professionals Follow-upp Study, or 2009 for the Nurses Health Study III), whichever came first.
