Table 2 Comparison of maternal medical complication, labor complication, and obstetric intervention among three study groups (%, 95%CI)

2.81 (2.72 – 2.90)

4.27 (3.55 – 5.00)*

4.67 (4.37 – 4.96)*

0.64 (0.60 – 0.69)

0.40 (0.17 – 0.62)

0.44 (0.35 – 0.53)*

0.90 (0.85 – 0.95)

1.36 (0.95 – 1.77)*

1.64 (1.46 – 1.82)*

3.46 (3.36 – 3.56)

3.02 (2.40 – 3.63)

2.15 (1.94 – 2.35)*

0.76 (0.71 – 0.80)

1.06 (0.69 – 1.43)

0.82 (0.70 – 0.95)

1.87 (1.80 – 1.94)

2.95 (2.35 – 3.55)*

2.08 (1.88 – 2.28)

0.07 (0.06 – 0.08)

0.17 (0.02 – 0.31)

0.19 (0.13 – 0.26)*

0.90 (0.85 – 0.95)

0.89 (0.56 – 1.23)

1.20 (1.04 – 1.35)*

7.61 (7.46 – 7.75)

6.39 (5.52 – 7.27)*

7.38 (7.01 – 7.75)

0.94 (0.89 – 0.99)

1.39 (0.97 – 1.81)

1.22 (1.07 – 1.38)*

0.81 (0.76 – 0.85)

0.80 (0.48 – 1.11)

0.72 (0.60 – 0.84)

0.28 (0.25 – 0.31)

0.56 (0.30 – 0.83)

0.40 (0.31 – 0.49)*

069 (0.64 – 0.73)

0.53 (0.27 – 0.79)

0.49 (0.39 – 0.58)*

1.10 (1.04 – 1.16)

0.83 (0.50 – 1.15)

0.97 (0.83 – 1.10)

1.36 (1.30 – 1.43)

1.36 (0.95 – 1.77)

1.48 (1.31 – 1.65)

1.37 (1.31 – 1.43)

2.09 (1.58 – 2.69)*

1.92 (1.73 – 2.11)*

6.34 (6.21 – 6.47)

7.19 (6.27 – 8.11)

7.91 (7.53 – 8.29)*

1.16 (1.10 – 1.22)

1.03 (0.67 – 1.39)

1.44 (1.27 – 1.61)*

0.47 (0.43 – 0.51)

0.50 (0.25 – 0.75)

0.30 (0.22 – 0.38)*

0.05 (0.04 – 0.06)

0.07 (0.03 – 0.16)

0.08 (0.04 – 0.12)

1.42 (1.36 – 1.49)

1.29 (0.89 – 1.70)

1.86 (1.67 – 2.04)*

0.56 (0.52 – 0.60)

0.63 (0.35 – 0.91)

0.52 (0.42 – 0.62)

2.34 (2.26 – 2.42)

1.52 (1.09 – 1.96)*

1.97 (1.77 – 2.16)*

21.3 (21.0 – 21.5)

21.4 (20.0 – 22.9)

21.4 (20.8 – 22.0)

0.90 (0.85 – 0.95)

0.76 (0.45 – 1.07)

0.52 (0.42 – 0.62)*

0.55 (0.51 – 0.59)

0.56 (0.30 – 0.88)

0.65 (0.54 – 0.77)

0.07 (0.06 – 0.09)

0.10 (0.01 – 0.21)

0.09 (0.05 – 0.13)

3.20 (3.10 – 3.29)

3.45 (2.79 – 4.10)

3.44 (3.18 – 3.70)

52.0 (51.7 – 52.3)

46.1 (44.7 – 48.2)*

47.5 (46.8 – 48.2)*

6.76 (6.62 – 6.89)

5.40 (4.59 – 6.21)*

4.46 (4.17 – 4.75)*

13.0 (12.8 – 13.2)

11.9 (10.7 – 13.0)

10.2 (9.8 – 10.6)*