Table 1.
Characteristics of the mother-child pairs.
| Variable | Value |
|---|---|
| Male, No. (%) | 469 (52.9) |
| Maternal education, No. (%) | |
| Junior or below | 31 (3.5) |
| High school | 110 (12.5) |
| College or above | 742 (84.0) |
| Paternal education, No. (%) | |
| Junior or below | 29 (3.3) |
| High school | 103 (11.7) |
| College or above | 752 (85.0) |
| Family income, mean (SD), yuan | |
| ≤5000 | 486 (56.0) |
| 5001–10,000 | 346 (39.9) |
| ≥10,001 | 36 (4.1) |
| Pre-pregnancy BMI group, mean (SD), kg/m2 | |
| Underweight | 169 (18.9) |
| Normal Weight | 584 (65.4) |
| Overweight | 107 (12.0) |
| Obesity | 33 (3.7) |
| GWG group, mean (SD), kg | |
| Inadequate | 186 (20.9) |
| Adequate | 412(46.3) |
| Excessive | 292(32.8) |
| Multiparous, No. (%) | 266 (29.8) |
| Maternal age, mean (SD), years | 29.9 (3.9) |
| Gestational week, median (IQR), weeks | 39.0 (1.4) |
| Pre-pregnancy-BMI, mean (SD), kg/m2 | 21.3 (3.0) |
| Birth weight, mean (SD), kg | 3.4 (0.4) |
| Weight at 1-month-old, mean (SD), kg | 4.5 (0.6) |
| Weight at 3 months old, mean (SD), kg | 6.7 (0.8) |
| Weight at 6 months old, mean (SD), kg | 8.2 (0.9) |
| Weight at 8 months old, mean (SD), kg | 8.9 (1.0) |
| Weight at 12 months old, mean (SD), kg | 9.8 (1.0) |
| Weight at 18 months old, mean (SD), kg | 11.1 (1.2) |
Abbreviation: GWG, gestational weight gain; SD, standard deviation; IQR, interquartile range. Owing to missing data, the number of cases does not always sum to 893.