Table 1

Development of the study sample

Sample addressed

T0(2001)

n (%)

Non-participants

n (%)

Study sample

T1(2001)

n (%)

Drop-outs

T1 – T2

n (%)

Study sample

T2(2003)

n (%)

Drop-outs

T1 – T3

n (%)

Study sample

T3(2005)

n (%)


Gender

female

487 (49)

108 (37)

379 (53)

96 (50)

283 (54)

98 (51)

281 (54)

male

517 (51)

181 (63)

336 (47)

97 (50)

239 (46)

95 (49)

241 (46)

Age in years

mean

27.4

27.6

29.3

31.5

31.3

range

23 – 44

23 – 44

26 – 44

29 – 48

27 – 46


Total

1004

289

715

193

522

193

522


Study sample

715

(100%)

(71% of 1004)

522

(73% of 715)

(52% of 1004)

522

(73% of 715)

(52% of 1004)


Buddeberg-Fischer et al. BMC Health Services Research 2006 6:137   doi:10.1186/1472-6963-6-137

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