Table 2.
Monthly weather conditions of case and control days, Montreal, April–October 1981–2010.
| Month | No. of SIDS | Mean maximum temperature [°C (range)] | Relative humidity (%) | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Previous day | Same day | Previous day | Same day | ||||||
| Cases | Controls | Cases | Controls | Cases | Controls | Cases | Controls | ||
| April | 29 | 9.4 (–1.5, 17.7) | 10.5 (0.5, 26.1) | 9.5 (1.0, 22.8) | 10.4 (0.0, 27.4) | 60.6 | 62.3 | 60.5 | 61.0 |
| May | 23 | 18.6 (10.1, 27.1) | 18.0 (8.6, 30.0) | 18.2 (10.0, 27.7) | 18.0 (8.3, 26.0) | 60.2 | 59.9 | 61.6 | 60.9 |
| June | 29 | 24.9 (13.0, 32.7) | 23.0 (9.5, 32.6) | 24.8 (11.3, 33.5) | 22.4 (9.8, 33.4) | 67.0 | 66.1 | 63.3 | 66.9 |
| July | 25 | 26.1 (17.2, 33.8) | 25.3 (12.6, 33.4) | 27.0 (17.8, 33.8) | 25.3 (13.0, 33.4) | 68.9 | 69.6 | 64.9 | 69.5 |
| August | 22 | 26.1 (19.3, 32.2) | 25.2 (13.8, 34.3) | 27.2 (17.8, 33.0) | 24.7 (16.6, 32.3) | 71.4 | 71.6 | 72.8 | 70.0 |
| September | 36 | 18.8 (10.1, 29.5) | 19.9 (9.9, 28.8) | 18.7 (10.6, 30.9) | 19.5 (10.6, 32.3) | 73.7 | 73.5 | 75.7 | 74.3 |
| October | 32 | 12.9 (2.8, 23.8) | 12.4 (4.0, 24.3) | 13.3 (3.0, 23.9) | 12.7 (3.7, 26.0) | 75.1 | 73.3 | 73.9 | 72.8 |