Table 2.
Mean gestational age for women with spontaneous deliveries in the spring exposure and primary control periods*
| Comparison unit | Exposure period |
Comparison period |
p Value | ||
|---|---|---|---|---|---|
| Number of deliveries | Mean gestational age (SD) in days | Number of deliveries | Mean gestational age (SD) in days | ||
| Whole week | 18 387 | 279.0 (12.1) | 36 835 | 278.9 (12.4) | 0.48 |
| Sunday | 2441 | 279.0 (12.3) | 5125 | 278.8 (12.6) | 0.72 |
| Monday | 2772 | 279.0 (12.2) | 5460 | 279.0 (12.4) | 0.99 |
| Tuesday | 2715 | 278.7 (12.6) | 5396 | 278.6 (13.1) | 0.78 |
| Wednesday | 2735 | 279.0 (11.8) | 5381 | 279.2 (11.7) | 0.60 |
| Thursday | 2616 | 278.8 (12.9) | 5311 | 278.9 (12.2) | 0.69 |
| Friday | 2600 | 279.2 (11.4) | 5201 | 278.8 (12.2) | 0.16 |
| Saturday | 2508 | 279.1 (11.3) | 4961 | 278.8 (12.3) | 0.37 |
*Only deliveries with data on gestational age are included.