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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

From: Cesarean and VBAC rates among immigrant vs. native-born women: a retrospective observational study from Taiwan Cesarean delivery and VBAC among immigrant women in Taiwan

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

  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.