Table 2 Descriptive characteristics of study population stratified by season
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 |