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Table 1 Characteristics of patients according to season

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

Characteristic Season P value
  Spring
(n = 2,566)
Summer
(n = 2,367)
Fall
(n = 2,275)
Winter
(n = 2,326)
 
Age, yearsa 60.1 ± 17.8 59.6 ± 18.0 60.4 ± 18.0 60.1 ± 17.6 0.48
Sex, percentage      
   Male 58.9 58.6 59.7 58.7 0.89
Race, percentage      
   Caucasian 79.1 81.5 81.0 79.1 0.04
   African-American 14.0 11.3 11.9 14.2  
   Other 6.9 7.2 7.1 6.7  
APACHE III scorea 51.4 ± 25.2 51.5 ± 25.4 52.9 ± 26.0 52.6 ± 26.4 0.09
Diagnostic category, percentage      
   Cardiovascular 28.1 28.2 31.9 28.8 0.01
   Trauma 15.4 17.3 14.7 13.9 0.01
   Gastrointestinal 9.5 8.3 9.5 9.2 0.41
   Sepsis 6.5 5.4 7.1 6.8 0.09
   Solid tumors 5.9 4.9 4.2 5.0 0.06
   Neuropsychiatric 4.8 3.6 4.0 4.5 0.18
   Pulmonary 4.1 3.7 4.6 4.2 0.50
   Renal 1.0 1.1 0.9 1.1 0.87
   Immunodeficiency 0.3 0.6 0.2 0.4 0.12
   Other 24.6 26.8 23.0 26.1 0.01
Type of ICU, percentage      
   Medical 32.9 33.1 29.8 32.9 0.05
   Coronary care 10.7 9.6 11.7 9.9 0.07
   Cardiothoracic 30.0 32.2 34.2 31.3 0.02
   Surgical 6.2 6.3 7.2 5.4 0.07
   Multidisciplinary 20.2 18.8 17.1 20.5 0.02
Length of stay, daysa 4.8 ± 6.6 5.2 ± 9.2 4.9 ± 6.6 5.1 ± 6.9 0.97
Mortality, percentage 10.2 10.0 11.4 11.2 0.29
  1. aValues are expressed as mean ± standard deviation. APACHE III, Acute Physiology and Chronic Health Evaluation III; ICU, intensive care unit.