Table 1.

Sociodemographic characteristics of the study population, including the derivation and validation dataset²⁸

	Derivation dataset		Validation dataset
	Mean	SD	Mean	SD
Age (years)c	34.4	18.92	31.98	18.54
	Count	%	Count	%
Gender
Male	17303	48.81	27302	49.9
Female	16507	51.16	27398	50.07
Missing	10	0.03	16	0.03
Ethnicity
Black	6879	20.34	7023	12.84
White	18627	55.08	35392	64.68
Asian	1129	3.34	2608	4.77
Mixed	1306	3.86	1957	3.58
Other	3466	10.25	2084	3.81
Missing	2413	7.13	5652	10.33
ICD-10 Index spectrum diagnosis
CHR-Pa	314	0.93	50	0.09
Acute and transient psychotic disorders	553	1.64	725	1.33
Substance use disorders	7149	21.14	6507	11.89
Bipolar mood disorders	950	2.81	1526	2.79
Non-bipolar mood disorders	6302	18.63	8841	16.16
Anxiety disorders	8235	24.35	15960	29.17
Personality disorders	1286	3.8	2116	3.87
Developmental disorders	1412	4.18	3706	6.77
Childhood/adolescence onset disorders	4200	12.42	9629	17.6
Physiological syndromes	2555	7.55	4424	8.09
Mental retardation	864	2.55	1232	2.25

^aLambeth and Southwark, n = 33820

^bCroydon and Lewisham, n = 54716

^cNot an ICD-10 Index spectrum diagnosis