Table 1 Sample description, split for CA and gender.

	CA+ (n = 631)	CA− (n = 499)	χ²/z/t	p value
Gender	Female = 358	Female = 262	1.85 (1)	0.17
Gender	Male = 273	Male = 237
Age 14^a	14.49 (0.28)	14.48 (0.28)	−0.43 (1049.3)	0.67
Age 17^a	17.49 (0.34)	17.48 (0.32)	−0.48 (1015.8)	0.63
SES	Hard pressed = 73	Hard pressed = 30	5.24	<0.001
	Moderate means = 36	Moderate means = 11
	Comfortably off = 168	Comfortably off = 104
	Urban prosperity = 37	Urban prosperity = 41
	Wealthy achievers = 317	Wealthy achievers = 313
Prior psychiatric	Yes = 199	Yes = 74	41.54 (1)	<0.001
History at age 14	No = 432	No = 425
Prior psychiatric	Yes = 267	Yes = 122	48.05 (1)	<0.001
History at age 17^a	No = 297	No = 345

	Female (n = 620)	Male (n = 510)	χ²/z/t	p value
Age 14^a	14.49 (0.27)	14.48 (0.29)	0.61 (1027)	0.54
Age 17^a	17.50 (0.32)	17.47 (0.34)	1.38 (954.71)	0.17
SES	Hard pressed = 51	Hard pressed = 52	1.33	0.18
	Moderate means = 23	Moderate means = 24
	Comfortably off = 154	Comfortably off = 118
	Urban prosperity = 34	Urban prosperity = 44
	Wealthy achievers = 358	Wealthy achievers = 272
Prior psychiatric	Yes = 176	Yes = 97	12.90 (1)	<0.001
History at age 14	No = 444	No = 413
Prior psychiatric	Yes = 249	Yes = 140	16.66 (1)	<0.001
History at age 17^a	No = 326	No = 316

For age we depict the mean values and the belonging standard deviations in brackets. The Pearson’s χ² tests were used for binary data and performed with Yate’s continuity correction. The z-test was used for the SES variable and was conducted as asymptotic linear-by-linear association test, to account for the ordering in the data. The t tests were used for continuous data and were conducted as Welsh’s two-sample t tests. Tests were conducted two-sided. SES was calculated based on the ACORN classification system (http://www.caci.co.uk)⁶¹. Prior psychiatric history was measured with the Schedule for Affective Disorders and Schizophrenia for School-Age Children (Present and Lifetime Version)⁶² and included learning disabilities, clinical sub-threshold diagnoses and deliberate self-harm at age 14; and clinical sub-threshold diagnoses and deliberate self-harm, but not learning disabilities, at age 17.
^aPlease note, the descriptive statistics are not based on the imputed data, which is why some participants have missing data on some descriptive variables, and accordingly some numbers do not add up.

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