Table 4.
Sensitivity analysis: Adjusted odds of cesarean vs. vaginal birth for native-born Taiwanese, Chinese and Vietnamese mothers among sub-groups categorized by maternal age, paternal age, previous cesarean, urban/rural, birth weight, and institutional setting
| Stratification variable | Chinese | Vietnamese | Taiwanese | ||
|---|---|---|---|---|---|
| Unadjusted | Adjusted | Unadjusted | Adjusted | Reference | |
| Maternal age | |||||
| Aged <20, n = 11390 | 0.70(0.08, 5.79) | 0.84(0.10, 7.27) | 0.74(0.65, 0.84) | 0.79(0.64, 0.98 | 1 |
| Aged 20-35, n = 337562 | 0.76(0.74, 0.79) | 0.86(0.83, 0.90) | 0.50(0.48, 0.52) | 0.57(0.54, 0.59) | 1 |
| Aged >35, n = 43294 | 0.73(0.66, 0.82) | 1.06(0.94, 1.21) | 0.80(0.64, 0.99 | 1.23(0.96, 1.60) | 1 |
| Paternal age (y/o) | |||||
| <25, n = 22270 | 0.93(0.65, 1.33) | 0.97(0.66, 1.43) | 0.73(0.52, 1.03) | 0.79(0.54, 1.14) | 1 |
| 25-35, n = 229915 | 0.74(0.70, 0.78) | 0.86(0.81, 0.91) | 0.47(0.44, 0.50) | 0.57(0.53, 0.61) | 1 |
| >35, n = 113639 | 0.60(0.57, 0.62) | 0.89(0.84, 0.94) | 0.37(0.35, 0.38) | 0.59(0.56, 0.62) | 1 |
| History of previous cesarean | |||||
| Yes, n = 55480 | 0.80(0.65, 0.98) | 0.78(0.62, 0.96) | 0.65(0.53, 0.81) | 0.61(0.49, 0.77) | 1 |
| No, n = 336766 | 0.84(0.80, 0.87) | 0.89(0.85, 0.92) | 0.54(0.52, 0.56) | 0.59(0.57, 0.62) | 1 |
| Urbanization | |||||
| Urban, n = 285771 | 0.74(0.72, 0.77) | 0.88(0.85, 0.92) | 0.47(0.45, 0.49) | 0.57(0.56, 0.62) | 1 |
| Suburban, n = 61117 | 0.78(0.72, 0.85) | 0.90(0.81, 0.99) | 0.49(0.45, 0.53) | 0.61(0.56, 0.67) | 1 |
| Rural, n = 45359 | 0.72(0.65, 0.79) | 0.80(0.71, 0.90) | 0.46(0.43, 0.50) | 0.59(0.53, 0.65) | 1 |
| Birthweight | |||||
| Birthweight <1SD, n = 48350 | 0.76(0.68, 0.85) | 0.91(0.80, 1.03 | 0.50(0.46, 0.55) | 0.69(0.62, 0.77) | 1 |
| Birthweight ± 1SD, n = 291608 | 074(0.71, 0.77) | 0.86(0.82, 0.90) | 0.46(0.44, 0.48) | 0.57(0.54, 0.60) | 1 |
| Birthweight > 1SD, n = 52288 | 0.69(0.64, 0.74) | 0.86(0.79, 0.93) | 0.50(0.45, 0.54) | 0.66(0.59, 0.73) | 1 |
| Institutional setting | |||||
| Clinic, n = 129252 | 0.74(0.70, 0.78) | 0.84(0.79, 0.90) | 0.44(0.42, 0.47) | 0.58(0.54, 0.62) | 1 |
| Hospital, n = 262994 | 0.69(0.64, 0.74) | 0.86(0.79, 0.93) | 0.50(0.46, 0.54) | 0.66(0.59, 0.73) | 1 |
* Odds ratios with statistical significance are in bold type. Adjusted odds are obtained after adjusting for all variables other than the categorization variable, per the list of variables used for the full sample, Table 3.