Table 1.
Characteristics of 1951 singleton births by infant's gender
| Boys | Girls | p Value | |
|---|---|---|---|
| n=994 | n=957 | ||
| Maternal demographic characteristics | |||
| Age (years, mean (SD)) | 26.9 (3.6) | 27.1 (3.9) | NS |
| Han-nationality (% (n)) | 90.6 (901) | 93.5 (895) | <0.05 |
| Education <9 years (% (n)) | 17.1 (170) | 23.3 (223) | <0.01 |
| With maternity insurance (% (n)) | 55 (547) | 49.7 (476) | <0.05 |
| A positive disease history (% (n)) | 4.9 (49) | 2.9 (28) | <0.05 |
| Urban residence (% (n)) | 75.4 (749) | 69.9 (666) | <0.01 |
| Variables measured at GCT | |||
| Gestation at GCT (weeks, mean, (SD)) | 25.1 (1.2) | 25.1 (1.1) | NS |
| SBP (mm Hg, mean (SD)) | 109.2 (11.1) | 107.9 (10.9) | <0.01 |
| DBP (mm Hg, mean (SD)) | 70.2 (7.8) | 69.6 (7.5) | NS |
| BG at GCT (mmol/L, mean (SD)) | 7.05 (1.50) | 7.06 (1.60) | NS |
| BG categories (% (n)) | NS | ||
| <6.70 mmol/L | 41.2 (409) | 43.7(418) | |
| 6.70–7.79 mmol/L | 30.8 (306) | 28.5 (273) | |
| ≥7.80 mmol/L | 28.1 (279) | 27.8 (266) | |
| BMI (kg/m2, mean (SD)) | 25.6 (3.5) | 25.6 (3.8) | NS |
| BMI quintiles (% (n)) | NS | ||
| Q1 | 18.9 (188) | 20.2 (193) | |
| Q2 | 19.7 (196) | 20.3 (194) | |
| Q3 | 20.4 (203) | 20.1 (192) | |
| Q4 | 22.3 (222) | 17.9 (171) | |
| Q5 | 18.6 (185) | 21.6 (207) | |
| Height (cm, mean (SD)) | 162.7 (5.0) | 162.5 (4.7) | NS |
| Children's characteristics at birth | |||
| Gestation at birth (weeks, mean (SD)) | 39.4 (1.2) | 39.7 (1.2) | <0.001 |
| Birth weight (g, mean (SD)) | 3445 (409.3) | 3375.3 (413.4) | <0.001 |
| Birth weight >4000 g (% (n)) | 10.4 (103) | 9.2 (88) | NS |
BG, blood glucose; BMI, body mass index; DBP, diastolic blood pressure; GCT, glucose challenge test; NS, not significant; SBP, systolic blood pressure.