Table 2 Cumulative photoperiod prior to intensive care unit admission according to season
From: Light and the outcome of the critically ill: an observational cohort study
Photoperiod | Season | P value | |||
|---|---|---|---|---|---|
Spring | Summer | Fall | Winter | ||
At 7 days | 96.4 ± 6.8 | 98.3 ± 5.9 | 73.8 ± 6.6 | 72.2 ± 5.9 | <0.001 |
At 28 days | 374.8 ± 29.0 | 400.5 ± 19.4 | 306.1 ± 28.4 | 281.1 ± 19.2 | <0.001 |
At 60 days | 764.3 ± 65.7 | 870.9 ± 25.2 | 694.7 ± 63.9 | 589.8 ± 24.0 | <0.001 |