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3. GPs 401 600 were sent an abbreviated questionnaire (AbQ) and offered an incentive.
GPs 401 600 were sent an abbreviated questionnaire (AbQ) and offered an incentive.
Among the four groups, response ranged from 20.1% (standard questionnaire with no incentive and abbreviated questionnaire with incentive) through 21.8% (standard questionnaire with incentive), to 26.0% (abbreviated questionnaire with no incentive).
In each survey the final mailing to non-responders was an abbreviated questionnaire which excluded questions about the F1 year.
In a 5-minute phone interview, the abbreviated questionnaire asked basic demographic and dietary (including vitamin supplement use) questions.
The entire cohort under observation is periodically assessed with an abbreviated questionnaire, full length structured interview, physical examination and nerve conduction study.
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These data were collected repeatedly during longitudinal follow-up, although generally in abbreviated questionnaires.
Results of an abbreviated diet questionnaire for comparisons of participants and non-participants, showed that vitamin use among controls adjusted for age, gender, and ethnicity was similar for participants and non-participants (OR = 1.3, 95% CI = 0.91 to 1.82; data not shown).
Please see abbreviated version of questionnaire as an additional file (Additional file 1).
In addition, dimensions of health status specific to coronary artery disease are assessed with the abbreviated Seattle Angina Questionnaire (SAQ) [ 12] which measures three angina-related domains: physical limitation, angina frequency, and quality of life.
Some of these studies have used self-made abbreviated versions of questionnaires, thus raising the question of the validity of the results.
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