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Table 1 Characteristics of hospitalized patients with UGIB secondary to PUD from 2004 to 2010

From: Upper gastrointestinal bleeding due to peptic ulcer disease is not associated with air pollution: a case-crossover study

Variable Overall Calgary Edmonton P-value
Patients (%) 2523 1374 (54.5) 1149 (45.5)  
Median Age in Years (IQR) 70.0 (54.0–80.0) 68.0 (53.0–80.0) 72.0 (56.0–80.0) 0.1
Sex (%)     0.9
 Male 1561 (61.9) 851 (61.9) 710 (61.8)  
 Female 962 (38.1) 523 (38.1) 439 (38.2)  
Number of Comorbidities (%)     <0.001
 0 1326 (52.6) 812 (59.1) 514 (44.7)  
 1 495 (19.6) 229 (16.7) 266 (23.2)  
 2 289 (11.5) 138 (10.0) 151 (13.1)  
 3 170 (6.7) 81 (5.9) 89 (7.8)  
 4 101 (4.0) 48 (3.5) 53 (4.6)  
 5 59 (2.3) 24 (1.8) 35 (3.1)  
 ≥6 83 (3.3) 42 (3.1) 41 (3.6)  
Season (%)     0.002
 Autumn 635 (25.2) 314 (22.9) 321 (27.9)  
 Spring 621 (24.6) 372 (27.0) 249 (21.7)  
 Summer 659 (26.1) 369 (26.9) 290 (25.2)  
 Winter 608 (24.1) 319 (23.2) 289 (25.2)  
Perforated PUD (%)     0.03
 No 2456 (97.3) 1346 (98.0) 1110 (96.6)  
 Yes 67 (2.7) 28 (2.0) 39 (3.4)