Table 2.
Age-adjusted and multivariate hazard ratios (95% confidence intervals, CI) for coronary heart disease and stroke mortality by gestation length and indication status, Norwegian Medical Birth Registry.
| Coronary Heart Disease | Stroke | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Women | Deaths n,(%) | Age-adjusted Hazard Ratio | Multivariate1 Hazard Ratio | 95% CI | Deaths n,(%) | Age-adjusted Hazard Ratio | Multivariate1 Hazard Ratio | 95% CI | |
| Spontaneous Deliveries | |||||||||
| 22–31 | 5488 | 23 (0.42) | 2.5 | 2.3 | 1.5 to 3.4 | 19 (0.35) | 1.9 | 1.8 | 1.1 to 2.8 |
| 32–34 | 8534 | 33 (0.39) | 2.5 | 2.4 | 1.7 to 3.4 | 29 (0.34) | 2.0 | 1.9 | 1.3 to 2.8 |
| 35–36 | 19208 | 62 (0.32) | 2.3 | 2.1 | 1.6 to 2.7 | 41 (0.21) | 1.3 | 1.3 | 0.9 to 1.7 |
| 37–38 | 71111 | 155 (0.22) | 1.6 | 1.5 | 1.3 to 1.8 | 161 (0.23) | 1.5 | 1.4 | 1.2 to 1.7 |
| 39–41 | 403028 | 573 (0.14) | 1.0 | 1.0 | reference | 640 (0.16) | 1.0 | 1.0 | reference |
| 42–44 | 76465 | 104 (0.14) | 1.0 | 1.0 | 0.8 to 1.2 | 116 (0.15) | 1.0 | 1.0 | 0.8 to 1.2 |
| Medically Indicated Deliveries | |||||||||
| 22–31 | 1648 | 7 (0.42) | 5.9 | 4.7 | 2.2 to 9.8 | 9 (0.55) | 5.9 | 5.4 | 2.8 to 10.4 |
| 32–34 | 2283 | 8 (0.35) | 4.4 | 3.4 | 1.7 to 6.9 | 5 (0.22) | 2.2 | 1.9 | 0.8 to 4.7 |
| 35–36 | 3820 | 25 (0.65) | 7.7 | 6.2 | 4.2 to 9.3 | 13 (0.34) | 3.3 | 2.9 | 1.7 to 5.1 |
| 37–38 | 12256 | 28 (0.23) | 2.8 | 2.3 | 1.6 to 3.4 | 14 (0.11) | 1.1 | 1.0 | 0.6 to 1.7 |
| 39–41 | 53094 | 112 (0.21) | 1.8 | 1.6 | 1.3 to 2.0 | 84 (0.16) | 1.2 | 1.1 | 0.9 to 1.4 |
| 42–44 | 31727 | 52 (0.16) | 1.1 | 1.1 | 0.8 to 1.5 | 50 (0.16) | 1.0 | 1.0 | 0.7 to 1.3 |
1
Adjusted for maternal age at delivery, year of delivery, and maternal education (less than high school, completed high school, university)