Table 1.

Descriptive statistics for the study variables (n = 15048)

	n	%	% deaths	% OHC
Outcome (1973-2009)
All-cause mortality
No	14259	94.8	–	8.5
Yes	789	5.2	–	23.1
Placement characteristics (1953-72)
Placement in OHC
No	13648	90.7	4.5	–
Yes	1400	9.3	13.0	–
Age at first placement
No OHC	13648	90.7	4.5	–
Early childhood	873	5.8	8.7	–
Middle childhood	176	1.2	15.3	–
Adolescence	351	2.3	22.5	–
Reason for placement
No OHC	13648	90.7	4.5	–
Family-related circumstances	913	6.1	7.6	–
Own behaviours	341	2.3	25.2	–
Both	146	1.0	18.5	–
Type of placement
No OHC	13648	90.7	4.5	–
Family foster home	304	2.0	13.5	–
Residental care	733	4.9	10.1	–
Both	363	2.4	18.5	–
Confounders at birth (1953)
Parental occupational class
Upper and upper middle class	2004	13.3	4.2	2.3
Lower middle class, officials	4638	30.8	5.1	6.9
Lower middle class, self-employed	922	6.1	4.2	9.6
Working class, skilled	4108	27.3	5.8	11.6
Working class, non-skilled	2800	18.6	5.8	14.3
Unclassified	576	3.8	4.9	11.9
Maternal age
Age 19 or younger	487	3.2	8.6	25.7
Ages 20-39	11397	75.7	5.4	9.4
Age 40 or older	529	3.5	4.0	10.0
No information	2635	17.5	4.4	6.0
Parental marital status
Married	13134	87.3	5.1	7.4
Unmarried	1914	12.7	6.4	22.4
Other types of welfare recipiency (1953-72)
Social assistance
No social assistance or OHC	11404	75.8	4.1	0.0
Social assistance but no OHC	2244	14.9	6.2	0.0
OHC	1400	9.3	13.0	100.0
Child welfare
No investigation by the CWC	11789	78.3	3.7	0.0
Investigation but no OHC	1859	12.4	9.2	0.0
OHC	1400	9.3	13.0	100.0