Table 1 Maternal and infant characteristics by maternal age categories among study population (N = 63,137)
| Â | Maternal age (years) | P-value | |||
|---|---|---|---|---|---|
|  | < 25 | 25–29 | 30–34 | ≥ 35 | |
Maternal characteristics | Â | Â | |||
Number, n (%) | 9872 (15.6) | 31,864 (50.5) | 15,834 (25.1) | 5567 (8.8) | Â |
Age, years | 22.9±1.3 | 27.0±1.3 | 31.6±1.4 | 37.1±2.1 | < 0.001 |
Pre-pregnancy BMI, kg/m2 | 20.4±2.7 | 20.7±2.8 | 21.6±2.9 | 22.4±2.9 | < 0.001 |
SBP, mmHg | 107.2±10.6 | 107.6±10.5 | 107.7±10.7 | 108.9±11.1 | < 0.001 |
DBP, mmHg | 64.8±7.7 | 65.5±7.8 | 65.8±8.0 | 66.5±8.3 | < 0.001 |
Level of education, n (%) | Â | Â | |||
≤ 9 years | 3206 (39.0) | 5470 (19.7) | 3192 (23.3) | 1587 (32.2) | < 0.001 |
> 9 years | 5008 (61.0) | 22,304 (80.3) | 10,523 (76.7) | 3348 (67.8) | Â |
Parity, n (%) | Â | Â | |||
1 | 5838 (64.4) | 16,909 (55.9) | 4194 (27.4) | 634 (11.7) | < 0.001 |
≥ 2 | 3221 (35.6) | 13,332 (44.1) | 11,127 (72.6) | 4795 (88.3) |  |
OGTT at 24–28 weeks |  |  | |||
Fasting plasma glucose, mmol/L | 4.4±0.4 | 4.5±0.4 | 4.6±0.4 | 4.6±0.4 | < 0.001 |
Postload 1-h, mmol/L | 7.3±1.6 | 7.7±1.6 | 8.2±1.7 | 8.6±1.7 | < 0.001 |
Postload 2-h, mmol/L | 6.2±1.2 | 6.6±1.3 | 7.0±1.4 | 7.5±1.5 | < 0.001 |
Infant characteristics | Â | Â | |||
Birth weight, kg | 3.2±0.4 | 3.2±0.5 | 3.2±0.5 | 3.2±0.5 | < 0.001 |
Infant sex, male, n (%) | 2981 (30.2) | 10,485 (32.9) | 5017 (31.7) | 1631 (29.3) | 0.140 |
Gestational age at birth, weeks | 39.0± 3.8 | 39.0±20.1 | 38.7±3.2 | 38.4±1.5 | < 0.001 |