Table 1 Sociodemographic characteristics of mothers and infants in different maternal rural-to-urban migrant status
| Maternal rural-to-urban migrant status | p-value | ||
|---|---|---|---|
|
Local (n = 4381) |
Migrant (n = 2515) | ||
| Maternal age, n (%) a | < 0.001 | ||
| < 25 | 577 (13.20) | 433 (17.28) | |
| 25- | 1562 (35.74) | 971 (38.75) | |
| 30- | 1265 (28.94) | 741 (29.57) | |
| 35- | 778 (17.80) | 297 (11.85) | |
| 40–53 | 189 (4.32) | 64 (2.55) | |
| Maternal BMI, n (%) b | 0.033 | ||
| Underweight (< 18.5 kg/m2) | 579 (13.98) | 351 (15.07) | |
| Normal weight (18.5–23.9 kg/m2) | 2671 (64.49) | 1544 (66.29) | |
| Overweight (24.0–27.9 kg/m2) | 651 (15.72) | 326 (14.00) | |
| Obesity (≥ 28.0 kg/m2) | 241 (5.82) | 108 (4.64) | |
| Infant birthweight, n (%) c | 0.288 | ||
| < 2500 g | 164 (3.79) | 81 (3.26) | |
| 2500–3999 g | 3775 (87.28) | 2202 (88.54) | |
| ≥ 4000 g | 386 (8.92) | 204 (8.20) | |
| Infant sex, n (%) | 0.627 | ||
| Male | 2224 (50.76) | 1292 (49.24) | |
| Female | 2157 (51.37) | 1223 (48.63) | |
| Maternal education level, n (%) d | 0.607 | ||
| Primary school and below | 264 (6.03) | 158 (6.29) | |
| Junior high school | 1071 (24.48) | 638 (25.40) | |
| Senior high school | 859 (19.63) | 464 (18.47) | |
| College and above | 2181 (49.85) | 1252 (49.84) | |
| Occupation, n (%) e | < 0.001 | ||
| Unemployment | 1562 (35.69) | 937 (37.35) | |
| Informal employment | 1410 (32.21) | 932 (37.15) | |
| Formal employment | 1405 (32.10) | 640 (25.51) | |
| Ethnicity, n (%) f | < 0.001 | ||
| Han | 3656 (83.57) | 1996 (79.59) | |
| Others | 719 (16.43) | 512 (20.41) | |
| Place of residence, n (%) | < 0.001 | ||
| Metropolis | 1910 (43.60) | 1639 (65.17) | |
| Medium sized/small cities | 2471 (56.40) | 876 (34.83) | |
| Delivery method, n (%) g | < 0.001 | ||
| Vaginal | 2618 (59.92) | 1615 (64.29) | |
| Caesarean section | 1751 (40.08) | 897 (35.71) | |
| Preterm birth, n (%) h | 0.140 | ||
| No | 4095 (95.19) | 2377 (95.96) | |
| Yes | 207 (4.81) | 100 (4.04) | |
