Table 1.

Unimputed frequencies and percentages for the key variables in the analyses

Variable	No. with characteristic for biomedical sample at 45 years (n = 9377)	Percentage with characteristic for biomedical sample at 45 years (n = 9377) a	Percentage with missing data out of n = 9377
Depressive ideas scale ⩾2	675	7.2	0.9
Thought that life isn't worth living in the past week	189	2.0	0.9
Illness in the household (7–16 years)	1415	15.1	26.2
Neglected/underfed appearance (7–11 years)	461	4.9	56.1
Maternal absence (7–16 years)	435	4.6	23.1
Paternal absence (7–16 years)	1125	12.0	21.8
In care (7–16 years)	307	3.3	38.9
Divorce of parents by age 16 years	882	9.4	11.2
Parental physical abuse b	563	6.0	0.7
Parental sexual abuse b	149	1.6	0.7
Life events at 42 years			2.5
0	4480	47.8
1 or more	4601	49.1
No of cohabiting partnership separations			2.6
0 or 1	8936	95.3
2 or more	441	4.7
No of periods of unemployment			0.0
0	5911	63.0
1	1981	21.1
2	672	7.2
3	575	6.1
CAGE – problems in past year at 33 years (score of 2 or more in either year)	570	6.0	11.3
CAGE – problems in past year at 42 years (score of 2 or more in either year)	720	7.6	4.5
Emotional support at 42 years (no)	298	3.2	3.1
Any long-standing illness at 42 years	2653	28.3	3.1
Gender (female)	4715	50.3	0.0
Social class at 42 years			16.7
I and II	3453	36.8
IIInm	1657	17.7
IIIm	1539	16.4
IV and V	1161	12.4
Qualifications at 33 years			12.9
None	632	6.7
O levels	3654	39.0
A levels or higher	3872	41.3
Externalizing at 16 years	803	8.5	22.9
Internalizing at 16 years	1092	11.6	16.6
Externalizing or internalizing at 16 years	1594	17.0	22.4

CAGE, Cutting down, Annoyance by criticism, Guilty feeling, and Eye-openers; nm, non-manual; m, manual.

^aThe percentages are given out of 9377 for each variable: this will underestimate the prevalence for variables with large amounts of missing data, as missing data are included in the total percentage out of 9377.

^bRetrospectively reported at 45 years.