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	0.666^a

Condition (%)			0.35^b
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	0.132^a

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.