Table 1 Background characteristics of index pregnancy, by tertiles of estimated pregnancy weight gain. Means (and SD) or percentiles are shown.
Pregnancy weight gain (kg) | ||||
|---|---|---|---|---|
< 11 (n = 696) | 11–15 (n = 697) | >15 (n = 696) | p-value | |
Background | ||||
Mother's age (year)1 | 27.0 (5.3) | 26.2 (4.9)2 | 26.2 (5.0)2 | 0.006 |
Mother's age at first birth (years) | 25.2 (4.8) | 24.4 (4.4)2 | 24.5 (4.4)2 | 0.003 |
Married (%)1 | 97 | 98 | 98 | 0.720 |
Visits to a private doctor (%)1 | 49 | 45 | 51 | 0.053 |
Mother's height (cm) | 161.2 (5.5) | 162.0 (5.2)2 | 162.9 (5.2)23 | <0.001 |
Mother's body mass index before pregnancy (kg/m2) | 22.3 (2.9) | 21.6 (2.3)2 | 21.6 (2.5)2 | <0.001 |
Mother's age at menarche (year) | 14.2 (1.6) | 13.9 (1.6)2 | 13.8 (1.6)2 | <0.001 |
Regular menstrual cycles (%) | 94 | 93 | 95 | 0.296 |
Parity (at index birth) | 1.8 (1.1) | 1.8 (1.0) | 1.8 (1.1) | 0.896 |
Index pregnancy | ||||
Gestation weeks at delivery (week) | 40.6 (2.2) | 40.4 (2.1) | 40.2 (2.2)2 | <0.001 |
Exposed to estrogens (%) | 45 | 49 | 52 | 0.040 |
Weight of the placenta (g)4 | 603 (112) | 634 (124)2 | 661(205)23 | <0.001 |
Infant height (cm)4 | 50.0 (2.3) | 50.3 (2.1) | 50.6 (2.5)23 | <0.001 |
Infant weight (g) | 3,376 (514) | 3,466 (504)2 | 3,577(544)23 | <0.001 |
Low birth weight (%) | 5 | 3 | 3 | 0.305 |