131 Cardiac surgery in Influenza-Like-Illness season 6 Supplementary Results Baseline season (n=13,440) Intermediate season (n=15,843) ILI season (N=12,994) P value Age, years 68 (61 to 74) 68 (61 to 74) 68 (60 to 74) 0.56 Sex, male (%) 9883 (73.5) 11572 (73.0) 9538 (73.4) 0.61 Body Mass Index (BMI, kg/m2) 26.9 (24.3 to 29.8) 26.9 (24.5 to 29.9) 26.8 (24.4 to 29.8) 0.13 Chronic Kidney Disease (%) 546 (4.1) 654 (4.1) 540 (4.2) 0.93 Malignant neoplasm (%) 40 (0.3) 63 (0.4) 42 (0.3) 0.31 Cirrhosis (%) 40 (0.3) 46 (0.3) 40 (0.3) 0.96 Diabetes Mellitus (type I or II) (%) 2655 (19.8) 3289 (20.8) 2623 (20.2) 0.10 NYHA Class IV (%) 1015 (7.6) 1259 (7.9) 1068 (8.2) 0.13 ACEF II risk score 1.93 (1.36 to 2.58) 1.95 (1.38 to 2.60) 1.98 (1.40 to 2.65) 0.02 APACHE IV predicted mortality 1.21 (0.40 to 3.06) 1.24 (0.40 to 3.12) 1.27 (0.42 to 3.28) 0.01 Academic hospital (%) 5092 (37.9) 6287 (39.7) 5248 (40.4) <0.0001 ICU occupancy rate 0.98 (0.88 to 1.10) 1.04 (0.94 to 1.14) 1.12 (1.03 to 1.22) <0.0001 Supplementary Table 1. Clinical characteristics from patients who underwent surgery in the baseline season compared to ILI season. Median (IQR) was used to describe continuous variables. Frequency (%) was used to summarise categorical variables. ACEF II: Age, Creatinine and Ejection Fraction II risk score, predicting 30 day mortality after cardiac surgery14. APACHE IV predicted mortality predicts in-hospital mortality for patients on the first day of ICU admission22
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