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Table 2 The univariate unconditional logistic regression analysis of covariates for in-hospital mortality

From: Effects of seasonal and climate variations on in-hospital mortality and length of stay in patients with type A aortic dissection

Covariates Survive Death OR (95% CI)
Age (year)    
18–44 91 (97.8%) 2 (2.2%) 1.000
45–59 165 (93.8%) 11 (6.3%) 3.033 (0.658, 13.984)
60–74 119 (96.0%) 5 (4.0%) 1.912 (0.363, 10.079)
75–89 11 (100.0%) 0 (0.0%)
Gender    
Male 300 (95.5%) 14 (4.5%) 1.000
Female 86 (95.6%) 4 (4.4%) 1.003 (0.322, 3.127)
Hypertension    
No 107 (94.7%) 6 (5.3%) 1.000
Yes 279 (95.9%) 12 (4.1%) 0.767 (0.281, 2.095)
Coronary heart disease    
No 357 (96.0%) 15 (4.0%) 1.000
Yes 24 (75.0%) 8 (25.0%) 6.899 (3.598, 38.583)
Diabetes    
No 378 (95.7%) 17 (4.3%) 1
Yes 8 (88.9%) 1 (11.1%) 2.779 (0.329, 23.503)
COPD    
No 383 (95.5%) 18 (4.5%) 1.000
Yes 3 (100.0%) 0 (0.0%)
Renal dysfunctiona    
No 300 (93.2%) 22 (6.8%) 1.000
Yes 61 (74.4%) 21 (25.6%) 1.066 (0.537, 4.998)
Malperfusion syndromes    
No 303 (91.3%) 29 (8.7%) 1.000
Yes 60 (83.3%) 12 (16.7%) 2.033 (0.155, 5.684)
Average minimum temperature on the day of onset (°C)    
 < 11.00 83 (98.8%) 1 (1.2%) 1.000
[11.00, 16.00] 112 (95.7%) 5 (4.3%) 3.705 (0.425, 32.314)
(16.00–23.00] 98 (97.0%) 3 (3.0%) 2.541 (0.259, 24.890)
 > 23.00 93 (91.2%) 9 (8.8%) 8.032 (0.996, 64.750)
Average daily temperature difference (°C)    
 < 5.00 75 (97.4%) 2 (2.6%) 1.000
[5.00, 7.00] 136 (93.8%) 9 (6.2%) 2.482 (0.523, 11.785)
(7.00, 9.00] 105 (96.3%) 4 (3.7%) 1.429 (0.255, 8.002)
 > 9.00 70 (95.9%) 3 (4.1%) 1.607 (0.261, 9.905)
Air Quality Index, AQI    
0–50 244 (94.9%) 13 (5.1%) 1.000
51–100 140 (96.6%) 5 (3.4%) 0.670 (0.234, 1.920)
101–150 2 (100.0%) 0 (0.0%)
Season*    
Spring 74 (93.7%) 5 (6.3%) 1.000
Summer 69 (90.8%) 7 (9.2%) 2.770 (0.643, 11.930)
Autumn 108 (87.8%) 15 (12.2%) 4.159 (1.042, 16.604)
Winter 123 (97.6%) 3 (2.4%) 1.025 (0.203, 5.179)
Weekend surgery history    
No 313 (95.7%) 14 (4.3%) 1.000
Yes 73 (94.8%) 4 (5.2%) 1.225 (0.392, 3.831)
Admission route    
Outpatient admission 13 (92.9%) 1 (7.1%) 1.000
Emergency admission 372 (95.4%) 18 (4.6%) 4.488 (1.074, 5.655)
  1. *Season: autumn (21st September–20th December), winter (21st December–21st March), spring (22nd March–21st June 21), and summer (22nd June–20th September)
  2. aDefined as preoperative creatinine greater than 1.5 mg/dL