Table 1.

Child/young person baseline characteristics during the different time periods

	Group 1 (N = 308)	Group 2 (N = 183)	Group 3 (N = 204)	Group 4 (N = 101)	Group 5 (N = 232)
Age at randomisation (years) Mean [SD]	11.6 [3.1]	11.9 [3.2]	12.4 [3]	12.1 [3.3]	11.7 [3.1]
Female sex, n (%)	163 (53%)	94 (51%)	131 (64%)	61 (60%)	136 (59%)
White ethnicity, n (%)	258 (84%)	153 (85%)	169 (84%)	83 (84%)	205 (91%)
Missing (n)	2	4	2	2	7
Previous referral to CAMHS, n (%)	94 (31%)	63 (35%)	58 (29%)	35 (35%)	75 (33%)
Missing (n)	3	5	2	1	6