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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
  1. Values are expressed as mean ± standard error of the mean. Photoperiod is expressed in hours.