Variables | N (%) | Mean (SDa) | OR (95 % CIb) | P value |
---|---|---|---|---|
Total | 17475 | |||
Districts | ||||
Hebei | 2871 (16.4) | reference | ||
Liaoning | 1039 (5.9) | 1.56 (1.12,2.16) | 0.008 | |
Xiamen | 2080 (11.9) | 0.64 (0.45,0.89) | 0.009 | |
Hunan | 5294 (30.3) | 0.82 (0.64,1.05) | 0.119 | |
Sichuan | 1839 (10.5) | 0.90 (0.66,1.24) | 0.522 | |
Yunnan | 4352 (24.9) | 0.99 (0.77,1.27) | 0.911 | |
Type of residents | ||||
Local | 16847 (96.4) | reference | ||
Non-local | 628 (3.6) | 0.49 (0.27,0.90) | 0.021 | |
Maternal race/ethnicity | ||||
Han | 16485 (94.3) | reference | ||
Other | 990 (5.7) | 1.50 (1.11,2.03) | 0.008 | |
Maternal education | ||||
< =Junior high school | 7060 (40.4) | reference | ||
Senior high school | 3850 (22.0) | 0.89 (0.72,1.11) | 0.299 | |
College or graduate school | 3567 (20.4) | 0.90 (0.73,1.13) | 0.365 | |
Missing | 2998 (17.2) | 0.81 (0.64,1.04) | 0.093 | |
Maternal age | 26.7 (4.3) | |||
< 25 | 5633 (32.2) | reference | ||
25–35 | 10863 (62.2) | 1.10 (0.92,1.32) | 0.308 | |
> = 35 | 979 (5.6) | 1.89 (1.39,2.58) | <0.001 | |
Maternal pre-pregnancy BMI (kg/m2) | 20.7 (3.1) | |||
Underweight (<18.5) | 4335 (24.8) | 1.16 (0.96,2.00) | 0.129 | |
Normal (18.5–24.9) | 11559 (66.1) | reference | ||
Overweight (25.0–30.0) | 1347 (7.7) | 1.30 (0.98,1.73) | 0.072 | |
Obese (> = 30.0) | 234 (1.3) | 1.48 (0.80,2.74) | 0.210 | |
Parity | ||||
Nulliparous | 10001 (62.2) | reference | ||
Multiparous | 5098 (29.2) | 1.04 (0.86,1.25) | 0.696 | |
Missing | 2376 (13.6) | 1.08 (0.85,1.37) | 0.547 | |
Infant sex | ||||
Male | 9241 (52.9) | reference | ||
Female | 8234 (47.1) | 0.87 (0.74,1.02) | 0.094 | |
Rates of weight gain (2nd and 3rd trimester) (kg/week) | 0.56 (0.19) | |||
Insufficient | 2298 (12.5) | 1.46 (1.12,1.92) | 0.006 | |
Adequate | 5054 (28.9) | reference | ||
Excessive | 10123 (57.9) | 1.38 (1.13,1.68) | 0.002 | |
Gestational age at delivery (weeks) | 39.0 (1.3) | |||
Full-Term | 16874 (96.6) | |||
Preterm | 601 (3.4) |