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Table 3 Association between cumulative 28-day photoperiod and outcome

From: Light and the outcome of the critically ill: an observational cohort study

Exposure Odds ratioa 95% CI P value
Photoperiod28d    
   ALLb 0.997 0.994-0.999 0.03
   ALL (-APACHE III)c 0.998 0.995-1.001 0.14
Photoperiod28d quartilesb    
   First quartile 0.69 0.47-1.01 0.06
   Second quartile 0.79 0.57-1.10 0.16
   Third quartile 0.88 0.70-1.11 0.11
   Fourth quartile Referent   
  1. aFor each 1-hour increase in cumulative 28-day photoperiod. bAdjusted for Acute Physiology and Chronic Health Evaluation (APACHE) III, age, sex, race, season, admission diagnosis, and intensive care unit (ICU) location. cAdjusted for age, sex, race, season, admission diagnosis, and ICU location. CI, confidence interval.