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. 2006 Jan 1;56(522):35–42.

Table 3.

Comparison of respondents versus non-responders.

Variables Questionnaires returned (n = 565) Questionnaires not returned (n = 182) P-value
Mean age in years (SD) 59 (10.66) n = 515 58.6 (12.65) n = 173 0.666a

Condition (%) 0.35b
 Prostatism 147 (26) 53 (29)
 Atrial fibrillation 110 (19) 35 (19)
 Menorrhagia 99 (18) 39 (21)
 Menopausal symptoms 206 (37) 58 (31)

Age center school (SD) 15.7 (1.20) n = 504 15.5 (1.20) n = 127 0.132a

SF12 Physical score (SD) 42.06 (12.34) n = 470 42.45 (12.97) n = 144 0.74

SF12 Mental score (SD) 49.74 (10.53) n = 470 48.08 (11.88) n = 144 0.108
a

Independent t-test

b

χ2 test. n refers to usable data for each variable, from 565 returned questionnaires or available data from non-responders. SD = standard deviation.