From: Trends in maternal use of snus and smoking tobacco in pregnancy. A register study in southern Norway
Snus users (n = 1325 before pregnancy) | Smokers (n = 3165 before pregnancy) | |||||||
---|---|---|---|---|---|---|---|---|
% | OR | 95% CI | P-value | % | OR | 95% CI | P-value | |
Age groups | ||||||||
16–24 years | 67.1 | 1 | Ref | – | 54.4 | 1 | Ref | – |
25–34 years | 75.7 | 1.38 | 1.00–1.89 | 0.051 | 61.2 | 1.29 | 1.06–1.58 | 0.011 |
35–44 years | 75.3 | 1.69 | 0.84–3.42 | 0.142 | 56.8 | 1.15 | 0.86–1.54 | 0.331 |
Parity | ||||||||
Two or more previous children | 61.0 | 1 | Ref | – | 45.9 | 1 | Ref | – |
One previous child | 66,8 | 1.02 | 0.62–1.68 | 0.941 | 56.7 | 1.56 | 1.25–1.94 | 0.000 |
No previous children | 76.9 | 2.00 | 1.22–3.28 | 0.006 | 66.0 | 2.55 | 2.04–3.19 | 0.000 |
Education | ||||||||
Primary, lower secondary | 57.0 | 1 | Ref | – | 42.6 | 1 | Ref | – |
Upper secondary | 64.5 | 1.30 | 0.83–2.03 | 0.248 | 55.3 | 1.64 | 1.33–2.02 | 0.000 |
Higher education | 86.8 | 4.34 | 2.57–7.33 | 0.000 | 80.0 | 5.18 | 3.94–6.83 | 0.000 |
Time period | ||||||||
2012–2014 | 66.1 | 1 | Ref | – | 57.7 | 1 | Ref | – |
2015–2017 | 76.7 | 1.70 | 1.28–2.24 | 0.000 | 60.5 | 1.18 | 1.00–1.38 | 0.044 |