Table 1.

Comparison of REACH (Resilience, Ethnicity, and AdolesCent Mental Health) cohorts and target population demographics at baseline

	Target population (Key Stage 3 pupils in Lambeth and Southwark)a		REACH cohorts
	All		All		Cohort 1		Cohort 2		Cohort 3
	(n = 15 433)		(n = 4353)		(n = 1593)		(n = 1421)		(n = 1339)
	n	%	n	%	n	%	n	%	n	%
Gender
Boys	7799	50.5	2138	49.1	778	48.8	701	49.3	659	49.2
Girls	7634	49.5	2215	50.9	815	51.2	720	50.7	680	50.8
Receiving free school meals
No	11 544	74.8	3137	76.3	1142	76.5	1015	75.4	980	76.9
Yes	3889b	25.2b	976	23.7	351	23.5	331	24.6	294	23.1
Ethnic group
Black African	4195	27.2	1113	25.6	383	24.0	374	26.3	356	26.6
Black Caribbean	2160	14.0	719	16.5	234	14.7	257	18.1	228	17.0
Other Black	714	4.6	127	2.9	49	3.1	46	3.2	32	2.4
Mixed ethnic groups	1925	12.5	617	14.2	230	5.3	199	4.6	188	4.3
Indian, Pakistani, Bangladeshi	497	3.2	181	4.2	79	5.0	57	4.0	45	3.4
White British	2528	16.4	667	15.3	285	17.9	185	13.0	197	14.7
Non-British White	1671	10.8	626	14.4	224	5.1	200	4.6	202	4.6
Other/unknown	1339	8.7	303	7.0	109	6.8	103	7.3	91	6.8

^aLambeth and Southwark Key Stage 3 (KS3) demographics obtained, by application, from the National Pupil Database Spring 2017 School Census.

^bFree school meals (FSM) data for Lambeth and Southwark are not available by Key Stage, or by school year group, so the data presented here (percentage of Lambeth and Southwark pupils receiving free school meals) is for Key Stage 3 (i.e. Years 7–9, age 11–14) and Key Stage 4 (Years 10-11, age 14–16) pupils combined (25.2%, 2017 Spring Census. Source: Department for Education²³) and we used this to calculate an estimated frequency. Table adapted, with permission, from Knowles et al., 2021.²⁵