Table 4.

The effects of the socio‐economic status (SES) measures on the burden of smoking: number (n) and fraction (%) of women in each socio‐economic stratum, adjusted odds ratio (aOR; from model 3, Table 3), attributable fraction (AF) and stratum‐specific total attributable fraction (sTAF).

	N	%	aOR	AF	sTAF
Level and type of highest education
Tertiary level: university degrees	776	29.1	Ref.	Ref.	Ref.
Tertiary level: vocational degrees	804	30.1	2.2	0.54	0.16
Secondary level: vocational + general sec. school degree	220	8.2	4.4	0.77	0.06
Secondary level: general sec. school degree	216	8.1	2.9	0.65	0.05
Secondary level: vocational degree	578	21.7	9.5	0.89	0.19
Compulsory schooling only	73	2.7	14.4	0.93	0.03
All categories (TAF)					0.50
Occupational class (ESeC)
Salaried class	1130	42.4	Ref.	Ref.	Ref.
Intermediate class	406	15.2	1.2	0.16	0.02
Working class	965	36.2	1.3	0.23	0.08
Unemployed or no occupation	166	6.2	1.2	0.17	0.01
All categories (TAF)					0.12
Received income support
No	2523	95.8	Ref.	Ref.	Ref.
Yes	107	4.2	1.8	0.46	0.02
All categories (TAF)					0.02
Subjective economic wellbeing (SEW)
Lowest tertile	1112	41.9	1.2	0.16	0.07
Middle tertile	824	31.0	1.0	−0.05	−0.02
Highest tertile	719	27.1	Ref.	Ref.	Ref.
All categories (TAF)					0.05

Target population: the FinnBrain cohort mothers born 1976 or after (n = 2667). Data sources: FinnBrain questionnaires, except smoking in first trimester (linked from the Finnish Medical Birth Registry), education and occupational class (linked from Statistics Finland's registers).

Non‐imputed data were used when reporting number of cases in variable categories. Simulated multiple imputations for missing values were used for estimating proportions of cases in categories of income support recipiency (n missing values = 37) and SEW (n missing values = 12). ESeC = European Socio‐economic Classification.