Results of the variable validation analysis
| 1968–1989 | 1990–1997 | ||||||
|---|---|---|---|---|---|---|---|
| SIDS | No-SIDS | OR (95% CI) | SIDS | No-SIDS | OR (95% CI) | ||
| Predominantly N on day 0 | |||||||
| no | 517 (94.9) | 7241 (96.8) | 1.00 | 70 (92.1) | 2727 (95.8) | 1.00 | |
| yes | 28 (5.1) | 249 (3.3) | 1.74 (1.19, 2.52) | 6 (7.9) | 119 (4.2) | 1.73 (0.73, 4.05) | |
| Predominantly S on day 1 | |||||||
| no | 522 (95.8) | 6890 (92.0) | 1.00 | 69 (90.8) | 2608 (91.6) | 1.00 | |
| yes | 23 (4.2) | 601 (8.0) | 0.61 (0.40, 0.92) | 7 (9.2) | 238 (8.4) | 1.14 (0.52, 2.50) | |
| Predominantly S on day 3 | |||||||
| no | 522 (95.8) | 6890 (92.0) | 1.00 | 72 (94.7) | 2606 (91.6) | 1.00 | |
| yes | 23 (4.2) | 601 (8.0) | 0.60 (0.40, 0.91) | 4 (5.3) | 240 (8.4) | 0.61 (0.22, 1.68) | |
| Predominantly E on day 7 | |||||||
| no | 449 (82.4) | 5734 (76.5) | 1.00 | 60 (78.9) | 2190 (77.0) | 1.00 | |
| yes | 96 (17.6) | 1757 (23.5) | 0.87 (0.69, 1.08) | 16 (21.1) | 656 (23.0) | 1.07 (0.62, 1.85) | |
| Predominantly S or W on day 8 | |||||||
| no | 488 (89.5) | 6449 (86.1) | 1.00 | 62 (81.6) | 2345 (82.4) | 1.00 | |
| yes | 57 (10.5) | 1042 (13.9) | 0.70 (0.54, 0.92) | 14 (18.4) | 501 (17.6) | 0.99 (0.56, 1.78) | |
| Average hourly wind speed on day 3 (knots) | |||||||
| mean (se) | 7.56 (0.16) | 8.26 (0.04) | 0.97 (0.95, 0.99) | 7.83 (0.33) | 7.89 (0.06) | 1.00 (0.93, 1.08) | |
| Maximum wind speed on day 3 (knots) | |||||||
| mean (se) | 15.16 (0.24) | 16.17 (0.07) | 0.98 (0.97, 0.99) | 14.84 (0.51) | 15.06 (0.10) | 0.99 (0.95, 1.04) | |
| Absolute difference in predominance of windlessness on day 7–8 | |||||||
| no | 393 (72.1) | 6011 (80.2) | 1.00 | 70 (92.1) | 2622 (92.1) | 1.00 | |
| yes | 152 (27.9) | 1480 (19.8) | 1.27 (1.05, 1.51) | 6 (7.9) | 224 (7.9) | 0.91 (0.37, 2.19) | |