Table 1.
Characteristics of enrolled participants (February 2023)
| Characteristics | Group 1 | Group 2 | Total | Active | Drop out | Statistics | P value | |
| Number of subjects | 690 | 690 | 1380 | 1141 | 239 | |||
| Mother’s age | 30.83±3.80 | 31.44±3.59 | 31.14±3.71 | 31.28±3.73 | 30.44±3.54 | t=3.205 | 0.001 | |
| Delivery weeks | 39.05±0.937 | 39.19±1.072 | 39.12±1.01 | 39.14±1.01 | 39.03±1.02 | t=1.605 | 0.109 | |
| Birth mode | Natural childbirth | 314 (45.5%) | 381 (55.2%) | 695 (49.6%) | 586 (51.4%) | 109 (45.6%) | χ2=2.615 | 0.106 |
| Caesarean section | 376 (54.5%) | 309 (44.8%) | 685 (50.4%) | 555 (48.6%) | 130 (54.4%) | |||
| Infant’s gender | Male | 396 (57.4%) | 369 (53.5%) | 765 (55.4%) | 631 (55.3%) | 134 (56.1%) | χ2=0.047 | 0.829 |
| Female | 294 (42.6%) | 321 (46.5%) | 615 (44.6%) | 510 (44.7%) | 105 (43.9%) | |||
| Nation | Han | 619 (89.7%) | 639 (92.6%) | 1258 (91.2%) | 1041 (91.2%) | 217 (90.8%) | χ2=0.048 | 0.827 |
| Other | 71 (10.3%) | 51 (7.4%) | 122 (8.8%) | 100 (8.8%) | 22 (9.2%) | |||
| Birth weight (kg) | 3.33±0.372 | 3.33±0.389 | 3.33±0.380 | 3.34±0.375 | 3.29±0.401 | t=1.733 | 0.083 | |
| Birth length (cm) | 49.63±1.36 | 49.97±1.29 | 49.80±1.33 | 49.84±1.32 | 49.65±1.39 | t=1.925 | 0.054 |