| |
Univariate
|
Multivariate 1
|
Multivariate 2
|
|---|
| |
HR
|
95 % CI
|
HR
|
95 % CI
|
HR
|
95 % CI
|
|---|
|
Term birth
|
Ref
| | |
Ref
| | |
Ref
| | |
|
Any preterm birth
|
1.94
|
1.69
|
2.23
|
1.81
|
1.56
|
2.09
|
1.68
|
1.46
|
1.95
|
|
Preterm birth by severity
| | | | | | | | | |
|
Late preterm birth
|
1.68
|
1.39
|
2.03
|
1.58
|
1.31
|
1.91
|
1.49
|
1.23
|
1.80
|
|
Moderately preterm birth
|
2.20
|
1.64
|
2.97
|
2.07
|
1.54
|
2.78
|
1.90
|
1.41
|
2.56
|
|
Extremely preterm birth
|
2.45
|
1.90
|
3.16
|
2.32
|
1.75
|
3.07
|
2.13
|
1.61
|
2.82
|
|
Preterm birth by onset
| | | | | | | | | |
|
Spontaneous preterm birth
|
1.63
|
1.36
|
1.95
|
1.60
|
1.34
|
1.92
|
1.49
|
1.24
|
1.78
|
|
Indicated preterm birth
|
2.63
|
2.13
|
3.24
|
2.25
|
1.80
|
2.81
|
2.12
|
1.70
|
2.65
|
|
Preterm birth by number
| | | | | | | | | |
|
1 preterm birth
|
1.90
|
1.64
|
2.20
|
1.79
|
1.54
|
2.08
|
1.68
|
1.44
|
1.95
|
|
≥2 preterm births
|
2.43
|
1.58
|
3.73
|
1.99
|
1.28
|
3.07
|
1.76
|
1.14
|
2.73
|
|
Smokinga
| | | | | | | | | |
|
Never smoking during pregnancy
|
Ref
| | | | | |
Ref
| | |
|
Smoking before last pregnancy
|
2.08
|
1.68
|
2.57
| | | |
1.72
|
1.38
|
2.14
|
|
Smoking during last pregnancy
|
2.18
|
1.98
|
2.41
| | | |
2.04
|
1.84
|
2.27
|
- 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
