Table 3 Rate ratios associated with psychiatric history, labour market affiliation, gross income, educational achievement, and marital status comparing siblings (n = 1104) and controls (n = 16619).

	Sibling‐control rate ratio*
Psychiatric history
Currently admitted	4.58 (2.22 to 9.45)
Discharged ⩽365 days earlier	2.31 (1.28 to 4.17)
Discharged >365 days earlier	2.14 (1.58 to 2.89)
Never admitted	1
Labour market affiliation the previous year
Unemployed	1.30 (1.13 to 1.49)
Social benefits recipient	2.08 (1.31 to 3.30)
Disability pensioner	2.04 (1.34 to 3.09)
Student	0.77 (0.55to 1.08)
Otherwise not fully employed	1.15 (0.72 to 1.82)
Fully employed	1
Gross income the previous year
Lowest quartile	1.15 (0.96 to 1.37)
Second	1.08 (0.91 to 1.29)
Third	0.90 (0.76 to 1.08)
Highest quartile	1
Educational attainment
No information	2.07 (1.48 to 2.89)
Primary school (9/10 years)	1
High school only	0.77 (0.60 to 0.98)
Vocational training	0.75 (0.64 to 0.87)
Bachelor, high school + 3 to 4 years	0.76 (0.60 to 0.96)
Postgraduate degree	0.58 (0.40 to 0.86)
Marital status 1 January
Living single, age ⩾18 years	1.01 (0.85 to 1.20)
Cohabitant, age ⩾18 years	1.03 (0.85 to 1.23)
Married and living with the spouse	1

*Adjusted for age, sex, and year by stratification.