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Table 2 Univariate analysis of risk factors for POP after AADS in the training set

From: Development and validation of a risk prediction model for postoperative pneumonia in adult patients undergoing Stanford type A acute aortic dissection surgery: a case control study

Characteristic Without POP n = 217 (%) With POP n = 111 (%) χ2/Z/t P value
Demographics
Age (years) 48.0 ± 11.4 52.0 ± 10.3 3.067 0.002
Male 161 (74.2) 93 (83.8) 3.866 0.049
Body mass index (kg/m2) 25.3 ± 3.7 25.8 ± 4.0 1.254 0.211
Smoking history 80 (36.9) 58 (52.3) 7.133 0.008
Drinking history 72 (33.2) 37 (33.3) 0.001 0.978
Underlying conditions
Hypertension 145 (66.8) 76 (68.5) 0.091 0.763
Diabetes mellitus 9 (4.1) 6 (5.4) 0.266 0.606
Chronic obstructive pulmonary disease 5 (2.3) 11 (9.9) 9.155 0.002
Cerebrovascular disease 30 (13.8) 23 (20.7) 2.578 0.108
Peripheral vascular disease 25 (11.5) 18 (16.2) 1.421 0.233
Renal insufficiency 58 (26.7) 60 (54.1) 23.807  < 0.001
Gastrointestinal tract disease 18 (8.3) 8 (7.2) 0.119 0.730
Atrial fibrillation 1 (0.5) 1 (0.9) 0.235 0.628
General surgery history 45 (20.7) 24 (21.6) 0.035 0.852
Heart surgery history 16 (7.4) 9 (8.1) 0.056 0.812
New York Heart Association class    4.230 0.238
 I 137 (63.1) 74 (66.7)   
 II 61 (28.1) 24 (21.6)   
 III 17 (7.8) 9 (8.1)   
 IV 2 (0.9) 4 (3.6)   
Pulmonary artery hypertension 7 (3.2) 2 (1.8) 0.558 0.455
Pericardial effusion 68 (31.3) 29 (26.1) 0.957 0.328
Left ventricular ejection fraction (%) 62 (60, 65) 62 (60, 65) 0.343 0.732
Laboratory values
White blood cell count (× 109/L) 9.8 (7.3, 12.2) 11.1 (8.2, 14.1) 2.614 0.009
Red blood cell count (× 1012/L) 4.2 (3.8, 4.6) 4.2 (3.7, 4.5) 0.126 0.900
Hemoglobin (g/l) 128 (112, 138) 130 (114, 139) 0.653 0.514
Platelet count (× 109/L) 171 (133, 218) 143 (120, 185) 3.409 0.001
Serum creatinine (μmol/L) 78.5 (66.0, 104.6) 88.2 (65.8, 129.5) 2.218 0.027
Serum albumin (g/L) 37.9 ± 4.3 37.3 ± 4.5 1.183 0.238
Cardiopulmonary bypass time (minutes) 206 (169, 247) 231 (186, 275) 3.027 0.002
Aortic cross clamp time (minutes) 117 (94, 142) 126 (102, 160) 2.177 0.029
Transfusion of red blood cells (units) 6.5 (6, 8.5) 8.5 (6.5, 10.5) 4.749  < 0.001
  1. AADS Stanford type A acute aortic dissection surgery; POP postoperative pneumonia