Table 1.
Background characteristics in the total sample and by PTB: gestational age <week 37, LBW: weight <2500 g and SGA weight below the 10th percentile by gestational age at birth in the Mother and Child Cohort
| Total | PTB | LBW | SGA | |
|---|---|---|---|---|
| N=76 870 % |
N=3620 % |
N=2107 % |
N=6257 % |
|
| Age | ||||
| <20 | 1.5 | 2.2 | 2.6 | 1.9 |
| 20–24 | 12.2 | 12.7 | 13.8 | 13.2 |
| 25–29 | 36.2 | 34.6 | 34.8 | 36.4 |
| 30–34 | 35.7 | 33.7 | 33.2 | 34.2 |
| ≥35 | 14.4 | 16.7 | 15.6 | 14.3 |
| Education | ||||
| Primary | 2.4 | 3.1 | 3.9 | 2.7 |
| Secondary | 34.8 | 38.5 | 38.8 | 35.0 |
| Higher ≤4 years | 37.8 | 35.6 | 37.3 | 36.1 |
| Higher >4 years | 21.3 | 19.2 | 20.5 | 22.2 |
| Missing | 3.7 | 3.6 | 3.7 | 3.9 |
| Parity | ||||
| Nulliparous | 54.9 | 61.7 | 68.2 | 70.7 |
| Multiparous | 45.1 | 38.3 | 31.8 | 29.3 |
| Smoking | ||||
| No | 90.9 | 89.3 | 85.8 | 85.6 |
| Yes | 8.5 | 10.1 | 13.6 | 13.6 |
| Missing | 0.7 | 0.6 | 0.6 | 0.7 |
| Prepregnancy body mass index | ||||
| <20 | 12.4 | 12.8 | 15.6 | 19.1 |
| 20–24.9 | 54.9 | 49.9 | 50.8 | 55.6 |
| 25–29.9 | 21.0 | 22.0 | 19.0 | 15.2 |
| ≥30 | 9.2 | 12.6 | 11.8 | 7.6 |
| Missing | 2.5 | 2.7 | 2.9 | 2.4 |
| Mental distress | ||||
| No | 93.3 | 92.3 | 91.3 | 92.3 |
| Yes | 6.8 | 7.7 | 8.7 | 7.7 |
| Adult physical violence | ||||
| No | 85.5 | 83.9 | 83.6 | 84.7 |
| Yes | 14.5 | 16.1 | 16.4 | 15.3 |
| Child physical violence | ||||
| No | 94.5 | 94.4 | 94.1 | 94.3 |
| Yes | 5.5 | 5.6 | 5.9 | 5.5 |
| Adult emotional abuse | ||||
| No | 83.6 | 82.1 | 81.3 | 82.5 |
| Yes | 16.4 | 17.9 | 18.7 | 17. 5 |
| Child emotional abuse | ||||
| No | 86.2 | 85.1 | 84.7 | 85.5 |
| Yes | 13.8 | 14.9 | 15.3 | 14.5 |
LBW, low birth weight; PTB, preterm birth; SGA, small for gestational age.