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Table 1 Baseline characteristics of the analyzed patient groups

From: Dysfunction of alveolar macrophages after cardiac surgery and postoperative pneumonia? - an observational study

Characteristics Group 1 without pneumonia (n = 30) Group 2 with pneumonia (n = 3) P
Age, years 67 (59, 72) 79 (78, 84) 0.006a
Gender, m/f 22 (73%)/8 (27%) 2 (66%)/1 (33%) 0.88
Smoker, % 3 (10%) 0 (0%) 0.49
BMI, kg m-2 27.5 (25.5, 29.7) 26.9 (22.5, 28.03) 0.45
LVEF, % 55 (50, 60) 55 (50, 66) 0.75
Arterial hypertension, n/y 2/31 0/3 0.88
COPD, n/y 31/2 3/0 0.88
Renal insufficiency, % 2 (6.7%) 1 (33%) 0.49
Diabetes mellitus, % 6 (20%) 1 (33%) 0.75
Duration of anesthesia, minutes 270 (234, 318) 360 (330, 360) 0.019a
Duration of surgery, minutes 213 (173, 244) 275 (275, 320) 0.025a
CPB-time, minutes 73 (54, 99) 125 (101, 142) 0.030 a
Cross clamp time, minutes 41 (32, 61) 58 (40, 97) 0.235
Total ventilation time, hours 13 (11.0, 15) 24 (22, 25) 0.015a
Intraoperative blood transfusion, n/y 7 (23%) 3 (100%) 0.025a
Postoperativewound infection, % 4 (13.3%) 0 (0%) 0.75
Onset of pneumonia, postoperative day n/a 5 (4, 5) 0.10
Sepsis, % 0 (0%) 2 (67%) 0.06
  1. Data in brackets are presented as median and IQR or absolute values. aStatistically significant (P <0.05) (Mann–Whitney U-test for independent patient groups). Patients were divided retrospectively into two groups: group 1 without postoperative pneumonia and group 2 comprising three patients who developed postoperative pneumonia. m/f, male/female; n/y, no/yes; COPD, chronic obstructive pulmonary disease; CPB, cardiopulmonary bypass; n/a, not applicable.