Table 3.
Prevalence and correlates of PTD among sample mother–infant pairs
| Variables | Preterm birth | Univariate | Multivariate | ||
|---|---|---|---|---|---|
| (%, n/N) | OR (95% CI) | P | aOR (95% CI) | P | |
| Age(years) | |||||
| <35 | 5.9 (212/3608) | 1 | |||
| ⩾35 | 5.4 (38/710) | 0.91 (0.64–1.29) | 0.585 | ||
| Race | |||||
| Han | 4.0 (7/177) | 1 | |||
| Yi | 5.9 (244/4119) | 1.53 (0.71–3.29) | 0.278 | ||
| Other | 0.0 (0/6) | Null | |||
| Urban | |||||
| Yes | 3.6 (10/277) | 1 | 1 | ||
| No | 6.7 (211/3172) | 1.90 (1.00–3.63) | 0.051 | 2.11 (1.09–4.08) | 0.026 |
| Delivery hospital | |||||
| People's hospital | 4.6 (117/2534) | 1 | 1 | ||
| MCH | 2.2 (14/630) | 0.47 (0.27–0.82) | 0.008 | 0.43 (0.23–0.79) | 0.006 |
| HIV status | |||||
| Negative | 5.6 (232/4132) | 1 | 1 | ||
| Positive | 9.6 (20/208) | 1.79 (1.11–2.89) | 0.018 | 1.76 (1.06–2.91) | 0.029 |
| Syphilis | |||||
| Negative | 4.1 (128/3120) | 1 | |||
| Positive | 8.3 (6/72) | 2.13 (0.91–4.99) | 0.084 | ||
| Gravidity | |||||
| 1 | 6.9 (119/1731) | 1 | 1 | ||
| >1 | 5.2 (133/2575) | 0.74 (0.57–0.95) | 0.020 | 0.74 (0.56–0.97) | 0.027 |
| Parity | |||||
| None | 8.2 (59/724) | 1 | |||
| ⩾1 | 5.4 (193/3584) | 0.64 (0.47–0.87) | <0.004 | ||
| Mode of delivery | |||||
| Vaginal delivery | 5.6 (185/3300) | 1 | |||
| C-section (with medical indication) | 6.7 (64/957) | 1.21 (0.90–1.62) | 0.210 | ||
| C-section (without medical indication) | 2.0 (1/51) | 0.34 (0.05–2.45) | 0.283 | ||
Bold values are p<0.05.
Numbers not adding up due to missing; MCH, Maternal and Child Health Care Hospital.