| |
Univariate
|
Multivariate 1
|
Multivariate 2
|
|---|
| |
HR
|
95 % CI
|
HR
|
95 % CI
|
HR
|
95 % CI
|
|---|
|
Term birth
|
Ref
| | |
Ref
| | |
Ref
| | |
|
Any preterm birth
|
2.26
|
1.82
|
2.80
|
1.84
|
1.47
|
2.31
|
1.65
|
1.32
|
2.07
|
|
Preterm birth by severity
| | | | | | | | | |
|
Late preterm birth
|
2.09
|
1.59
|
2.77
|
1.80
|
1.36
|
2.38
|
1.63
|
1.23
|
2.15
|
|
Moderately preterm birth
|
2.61
|
1.49
|
3.80
|
1.98
|
1.24
|
3.18
|
1.73
|
1.08
|
2.78
|
|
Extremely preterm birth
|
2.38
|
1.73
|
3.92
|
1.85
|
1.17
|
2.94
|
1.66
|
1.05
|
2.62
|
|
Preterm birth by onset
| | | | | | | | | |
|
Spontaneous preterm birth
|
2.02
|
1.55
|
2.63
|
1.83
|
1.42
|
2.42
|
1.62
|
1.24
|
2.12
|
|
Indicated preterm birth
|
2.80
|
2.00
|
3.92
|
1.85
|
1.28
|
2.63
|
1.71
|
1.19
|
2.45
|
|
Preterm birth by number
| | | | | | | | | |
|
1 preterm birth
|
2.10
|
1.67
|
2.64
|
1.76
|
1.39
|
2.24
|
1.59
|
1.25
|
2.01
|
|
≥2 preterm births
|
4.32
|
2.49
|
7.48
|
2.75
|
1.56
|
4.84
|
2.36
|
1.34
|
4.16
|
|
Smokinga
| | | | | | | | | |
|
Never smoking during pregnancy
|
Ref
| | | | | |
Ref
| | |
|
Smoking before last pregnancy
|
2.45
|
1.71
|
3.52
| | | |
1.78
|
1.23
|
2.58
|
|
Smoking during last pregnancy
|
3.48
|
3.00
|
4.05
| | | |
3.04
|
2.58
|
3.57
|
- Multivariate 1: Preterm birth adjusted for maternal age at delivery, country of birth, socioeconomic status, number of births, SGA, pregestational and gestational diabetes
- Multivariate 2: Variables in Multivariate 1 + maternal smoking during pregnancy
- a: Multivariate 2 adjusted for any preterm birth
