E/N | Model 1 | Model 2 | Model 3 | Model 4 | Model 5 | ||||||
---|---|---|---|---|---|---|---|---|---|---|---|
HR (95% CI) | P value | HR (95% CI) | P value | HR (95% CI) | P value | HR (95% CI) | P value | HR (95% CI) | P value | ||
Parity (continuous variable) | |||||||||||
Per each additional | 323/2492 | 1.12 (1.04–1.19) | 0.001 | 1.11 (1.04–1.19) | 0.003 | 1.10 (1.03–1.18) | 0.007 | 1.06 (0.99–1.13) | 0.118 | 1.06 (0.98–1.13) | 0.126 |
Number of parity | |||||||||||
1 | 10/173 | 1 | 1 | 1 | 1 | 1 | |||||
2 | 54/597 | 1.51 (0.77–2.97) | 0.229 | 1.51 (0.77–2.97) | 0.234 | 1.49 (0.76–2.93) | 0.249 | 1.42 (0.72–2.80) | 0.307 | 1.40 (0.71–2.75) | 0.335 |
3 | 72/624 | 1.74 (0.89–3.38) | 0.104 | 1.72 (0.88–3.36) | 0.114 | 1.67 (0.85–3.28) | 0.134 | 1.50 (0.77–2.95) | 0.235 | 1.45 (0.74–2.85) | 0.276 |
≥ 4 | 187/1098 | 2.16 (1.11–4.20) | 0.023 | 2.11 (1.08–4.13) | 0.029 | 2.03 (1.03–3.98) | 0.040 | 1.55 (0.79–3.05) | 0.200 | 1.47 (0.75–2.89) | 0.267 |
P value for trend | 0.006 | 0.010 | 0.017 | 0.298 | 0.432 |