Table 2 Participant (patient) characteristics

No. recruited

28

26

35

89

Male/female ratio

8:20

10:16

12:23

30:59

Withdrawals (%)

0

2 (7.7%)

2 (5.7%)

4 (4.5%)

  N (%^a)

13 (46.4%)

18 (69.2%)

13 (37.1%)

44 (49.4%)

 Male/female ratio

4:9

8:10

3:10

15:29

 Mean age, years (range)

14.3 (12–16)

14.4 (12–17)

14.3 (12–16)

14.3

  N (%^a)

15 (53.6%)

8 (30.8%)

22 (62.9%)

45 (50.6%)

 Male/female ratio

4:11

2:6

9:13

1:2

 Mean age, years (range)

14.7 (11–17)

15.3 (12–18)

14.1 (12–17)

14.5