Table 2 Relation between parity and spontaneous preterm birth < 37, < 32, < 28 and between 34 and 37 weeks of gestation
From: The association between parity and spontaneous preterm birth: a population based study
Unadjusted OR (95% CI) | A*: Adjusted OR (95% CI) | B**: Adjusted OR (95% CI) | |
|---|---|---|---|
PTB < 37 weeks | |||
P0 | 1.83 (1.78–1.88) | 1.95 (1.89–2.00) | 1.93 (1.88–1.98) |
P1 (ref) | 1.0 | 1.0 | 1.0 |
P2 | 0.94 (0.90–0.99) | 0.92 (0.88–0.97) | 0.93 (0.89–0.97) |
P3 | 1.06 (0.99–1.13) | 1.00 (0.93–1.08) | 1.01 (0.94–1.08) |
P4 | 1.34 (1.20–1.50) | 1.26 (1.13–1.41) | 1.27 (1.14–1.42) |
PTB < 32 weeks | |||
P0 | 2.04 (1.89–2.21) | 2.15 (1.98–2.33) | 2.19 (2.02–2.38) |
P1 (ref) | 1.0 | 1.0 | 1.0 |
P2 | 1.10 (0.97–1.25) | 1.05 (0.92–1.19) | 1.06 (0.93–1.20) |
P3 | 1.32 (1.09–1.59) | 1.15 (0.95–1.40) | 1.17 (0.97–1.42) |
P4 | 2.05 (1.57–2.67) | 1.72 (1.31–2.25) | 1.76 (1.34–2.31) |
PTB < 28 weeks | |||
P0 | 1.95 (1.72–2.20) | 2.02 (1.78–2.29) | 2..11 (1.86–2.39) |
P1 (ref) | 1.0 | 1.0 | 1.0 |
P2 | 1.07 (0.89–1.30) | 1.00 (0.82–1.21) | 1.03 (0.85–1.25) |
P3 | 1.65 (1.27–2.16) | 1.38 (1.05–1.81) | 1.44 (1.10–1.88) |
P4 | 3.10 (2.21–4.35) | 2.44 (1.73–3.45) | 2.59 (1.84–3.66) |
PTB 34–37 weeks | |||
P0 | 1.75 (1.70–1.80) | 1.85 (1.79–1.91) | 1.83 (1.77–1.89) |
P1 (ref) | 1.0 | 1.0 | 1.0 |
P2 | 0.91 (0.87–0.96) | 0.90 (0.85–0.94) | 0.90 (0.85–0.95) |
P3 | 1.00 (0.93–1.09) | 0.97 (0.89–1.05) | 0.97 (0.90–1.06) |
P4 | 1.22 (1.08–1.39) | 1.17 (1.03–1.33) | 1.18 (1.03–1.34) |