| Determinant | No. of term and post-term live births | No. of cases | Rate per 1000 live births | Rate ratio (95% CI) | |
|---|---|---|---|---|---|
| Crude | Adjusted* | ||||
| Age, yr | |||||
| < 20 | 11 504 | 92 | 8.0 (6.5-9.8) | 1.07 (0.85-1.34) | 0.98 (0.78-1.23) |
| 20-24 (ref) | 52 289 | 391 | 7.5 (6.8-8.3) | 1.00 (-) | 1.00 (-) |
| 25-29 | 108 508 | 742 | 6.8 (6.4-7.3) | 0.91 (0.81-1.03) | 0.93 (0.83-1.06) |
| 30-34 | 129 939 | 930 | 7.2 (6.7-7.6) | 0.96 (0.85-1.08) | 1.01 (0.90-1.14) |
| 35-39 | 71 894 | 495 | 6.9 (6.3-7.5) | 0.92 (0.81-1.05) | 1.01 (0.88-1.16) |
| ≥ 40 | 15 968 | 104 | 6.5 (5.3-7.9) | 0.87 (0.70-1.08) | 0.96 (0.78-1.20) |
| Parity | |||||
| 0 | 180 970 | 1 519 | 8.4 (8.0-8.8) | 1.42 (1.32-1.54) | 1.47 (1.36-1.59) |
| ≥ 1 (ref) | 209 121 | 1 235 | 5.9 (5.6-6.2) | 1.00 (-) | 1.00 (-) |
| Body mass index | |||||
| < 18 | 16 473 | 106 | 6.4 (5.3-7.8) | 0.92 (0.75-1.12) | 0.94 (0.77-1.14) |
| 18-24 (ref) | 167 813 | 1 174 | 7.0 (6.6-7.4) | 1.00 (-) | 1.00 (-) |
| 25-29 | 56 208 | 398 | 7.1 (6.4-7.8) | 1.01 (0.90-1.13) | 1.01 (0.90-1.14) |
| ≥ 30 | 33 730 | 270 | 8.0 (7.1-9.0) | 1.15 (1.00-1.31) | 1.14 (1.00-1.30) |
| Missing data | 115 881 | 806 | 7.0 (6.5-7.5) | 0.99 (0.91-1.09) | 1.06 (0.97-1.16) |
| Plurality | |||||
| Singleton (ref) | 385 104 | 2 727 | 7.1 (6.8-7.4) | 1.00 (-) | 1.00 (-) |
| Multiple | 4 995 | 27 | 5.4 (3.6-7.9) | 0.76 (0.52-1.11) | 0.68 (0.63-0.74) |
| Infant sex | |||||
| Female (ref) | 190 993 | 966 | 5.1 (4.7-5.4) | 1.00 (-) | 1.00 (-) |
| Male | 199 106 | 1 788 | 9.0 (8.6-9.4) | 1.78 (1.65-1.93) | 1.74 (1.61-1.89) |
| Birth weight,† g | |||||
| 2000-2499 | 5 315 | 31 | 5.8 (4.0-8.3) | 0.88 (0.61-1.25) | 0.90 (0.63-1.29) |
| 2500-2999 | 50 987 | 311 | 6.1 (5.4-6.8) | 0.92 (0.81-1.04) | 0.94 (0.82-1.06) |
| 3000-3499 (ref) | 149 808 | 996 | 6.6 (6.2-7.1) | 1.00 (-) | 1.00 (-) |
| 3500-3999 | 131 133 | 945 | 7.2 (6.8-7.7) | 1.08 (0.99-1.19) | 1.06 (0.97-1.16) |
| 4000-4499 | 44 505 | 389 | 8.7 (7.9-9.6) | 1.32 (1.17-1.48) | 1.26 (1.12-1.42) |
| ≥ 4500 | 8 127 | 80 | 9.8 (7.8-12.2) | 1.49 (1.18-1.87) | 1.39 (1.11-1.76) |
| Year | |||||
| 2004 (ref) | 36 593 | 199 | 5.4 (4.7-6.2) | 1.00 (-) | 1.00 (-) |
| 2005 | 36 791 | 218 | 5.9 (5.2-6.8) | 1.09 (0.90-1.32) | 1.09 (0.90-1.32) |
| 2006 | 37 802 | 202 | 5.3 (4.6-6.1) | 0.98 (0.81-1.20) | 0.98 (0.80-1.19) |
| 2007 | 39 743 | 232 | 5.8 (5.1-6.6) | 1.07 (0.89-1.30) | 1.07 (0.88-1.29) |
| 2008 | 40 267 | 281 | 7.0 (6.2-7.8) | 1.29 (1.07-1.54) | 1.28 (1.06-1.53) |
| 2009 | 40 367 | 282 | 7.0 (6.2-7.8) | 1.29 (1.07-1.54) | 1.28 (1.07-1.54) |
| 2010 | 39 610 | 279 | 7.0 (6.2-7.9) | 1.30 (1.08-1.56) | 1.29 (1.08-1.55) |
| 2011 | 39 827 | 366 | 9.2 (8.3-10.2) | 1.70 (1.43-2.02) | 1.70 (1.43-2.02) |
| 2012 | 39 936 | 335 | 8.4 (7.5-9.3) | 1.55 (1.30-1.84) | 1.55 (1.30-1.85) |
| 2013 | 39 169 | 360 | 9.2 (8.3-10.2) | 1.70 (1.43-2.02) | 1.70 (1.43-2.02) |
Note: CI - confidence interval, ref = reference category.
*Adjusted for all other factors in the table.
†Results for live births < 2000 g not shown because of small number of cases (< 5).