Table 1

Childhood socio-demographic characteristics of baseline sample, respondents lost to follow-up and respondents followed-up at waves 2 and 5

	All participants at baseline (n=1495)^*		Not followed-up (n=645)^*		Followed-up at waves 2 and 5 (n=850)		p Value^†
	n	%	n	%	n	%	p Value^†
Sex
Male	730	48.8	348	53.9	382	44.9	<0.001
Female	765	51.2	297	46.1	468	55.1	<0.001
Area-level deprivation
DepCat 1–3 (least deprived)	434	29.0	153	23.7	281	33.1	<0.001
DepCat 4–5	567	37.9	227	35.2	340	40.0
DepCat 6–7 (most deprived)	494	33.1	265	41.1	229	26.9
Housing tenure
Homeowner	644	43.1	222	34.5	422	49.6	<0.001
Non-homeowner	850	56.9	422	65.5	428	50.4	<0.001
Head of household social class
I, II and III (non-manual)	593	39.8	202	31.6	391	46.0	<0.001
III (manual)	564	37.9	268	42.0	296	34.8
IV and V	332	22.3	169	26.4	163	19.2
Family structure
Intact family	1194	79.9	501	77.7	693	81.5	0.066
Non-intact family	301	20.1	144	23.3	157	18.5	0.066
Number of siblings
None	74	5.0	32	5.0	42	4.9	0.003
One	541	36.2	212	32.9	329	38.7
Two to three	643	43.0	274	42.5	369	43.4
Four or more	237	15.8	127	19.7	110	13.0
Number of school moves
None	957	64.0	387	60.0	570	67.1	0.007
One to two	482	32.2	226	35.0	256	30.1
Three or more	56	3.8	32	5.0	24	2.8

↵* In the baseline sample (and in the sample that was not followed-up), there were 20 individuals who had missing data across at least half of the socio-demographic characteristics and so were excluded from this table. In addition, there was one missing housing tenure response and six missing responses for questions relating to the construction of the head of household social class variable.
↵† p Value for the χ² test of association of those followed-up at waves 2 and 5 with those not followed-up.