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Table 1 Demographic characteristics of the 1239 blood donors randomized to the two orders of administration for the computerized HealthQuiz (HQ) and the written Donor Health Assessment Questionnaire (DHAQ).

From: Comparison of deferral rates using a computerized versus written blood donor questionnaire: a randomized, cross-over study [ISRCTN84429599]

  HQ followed by DHAQ (n = 604) n (%) DHAQ followed by HQ (n = 635) n (%)
Female gender 47.7 (288/604) 54.5 (346/635)
Annual household income > $24,000 83.3 (438/526) 83.3 (440/528)
9 or more years of schooling 95.9 (561/585) 95.0 (584/615)
English spoken at home 94.4 (559/592) 94.6 (586/619)
Age (mean years, SD) 33.9, 14.7 34.1, 14.5