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Table 2 Descriptive characteristics of study population stratified by season

From: Seasonality of acute kidney injury in a tertiary hospital academic center: an observational cohort study

  Spring Summer Autumn Winter p value
n 17,213 14,674 16,330 16,393  
Age, years, mean (SD) 60.8 (17.8) 60.7 (18.2) 60.1 (18.0) 61.0 (17.9) < 0.001
Sex, Males, n (%) 8005 (46.5) 6831 (46.6) 7475 (45.8) 7609 (46.4) 0.463
Charlson/Deyo score, n (%)      < 0.001
 0 13,332 (77.5) 11,556 (78.8) 12,870 (78.8) 12,597 (76.8)  
 1 2631 (15.3) 2190 (14.9) 2379 (14.6) 2614 (15.9)  
 2 701 (4.1) 538 (3.7) 624 (3.8) 655 (4.0)  
 > 2 549 (3.2) 390 (2.7) 457 (2.8) 527 (3.2)  
Charlson/Deyo score, mean (SD) 0.4 (0.9) 0.3 (0.8) 0.3 (0.8) 0.4 (0.9) < 0.001
Comorbidity, n (%)
 Cardiovascular 6780 (39.4) 5506 (37.5) 6135 (37.6) 6534 (39.9) < 0.001
 Gastrointestinal 2675 (15.5) 2232 (15.2) 2480 (15.2) 2510 (15.3) 0.8
 Malignancies 5365 (31.2) 4536 (30.9) 5160 (31.6) 5168 (31.5) 0.526
 Endocrine/Metabolic 3122 (18.1) 2533 (17.3) 2805 (17.2) 2922 (17.8) 0.067
 Genito/Urinary 2011 (11.7) 1733 (11.8) 1992 (12.2) 1922 (11.7) 0.453
 Infectious 876 (5.1) 816 (5.6) 778 (4.8) 806 (4.9) 0.01
 Respiratory 2241 (13.0) 1790 (12.2) 1945 (11.9) 2302 (14.0) < 0.001
eGFR, ml/min/1.73m2, median (IQR)* 81.0 (37.0) 79.0 (37.0) 81.0 (36.0) 82. 0 (36.0) < 0.001
  1. * eGFR at hospital admission