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Table 1 Baseline characteristics of 1260 laryngeal cancer patients divided by different ABO blood groups

From: ABO blood group is a predictor of survival in patients with laryngeal cancer

Characteristic Total ABO blood group [cases (%)] χ2 P
A (n = 347) B (n = 332) AB (n = 101) O (n = 480)
Sex       1.576 0.665
 Men 1226 338 (27.6) 320 (26.1) 99 (8.1) 469 (38.2)   
 Women 34 9 (26.5) 12 (35.3) 2 (5.9) 11 (32.3)   
Age (years)a       2.122 0.547
 ≤61 661 176 (26.6) 168 (25.4) 53 (8.0) 264 (40.0)   
 >61 599 171 (28.5) 164 (27.4) 48 (8.0) 216 (36.1)   
Smoking indexb       4.010 0.260
 ≤600 659 191 (29.0) 178 (27.0) 45 (6.8) 245 (37.2)   
 >600 601 156 (26.0) 154 (25.6) 56 (9.3) 235 (39.1)   
Alcohol consumption       4.899 0.179
 No 808 219 (27.1) 226 (28.0) 69 (8.5) 294 (36.4)   
 Yes 452 128 (28.3) 106 (23.5) 32 (7.1) 186 (41.1)   
Tumor differentiation       3.452 0.750
 Well 600 170 (28.4) 149 (24.8) 54 (9.0) 227 (37.8)   
 Moderate 481 132 (27.4) 134 (27.9) 32 (6.7) 183 (38.0)   
 Poor 179 45 (25.1) 49 (27.4) 15 (8.4) 70 (39.1)   
Primary site       16.755 0.010
 Glottic 885 244 (27.6) 242 (27.3) 79 (8.9) 320 (36.2)   
 Supraglottic 331 83 (25.1) 82 (24.8) 22 (6.6) 144 (43.5)   
 Subglottic 44 20 (45.5) 8 (18.2) 0 (0) 16 (36.3)   
T category       7.212 0.615
 T1 434 119 (27.4) 123 (28.4) 31 (7.1) 161 (37.1)   
 T2 382 115 (30.1) 94 (24.6) 31 (8.1) 142 (37.2)   
 T3 244 58 (23.8) 65 (26.6) 26 (10.7) 95 (38.9)   
 T4 200 55 (27.5) 50 (25.0) 13 (6.5) 82 (41.0)   
N category       2.319 0.509
 N0 1021 289 (28.3) 269 (26.3) 83 (8.1) 380 (37.2)   
 N+ 239 58 (24.3) 63 (26.4) 18 (7.5) 100 (41.8)   
UICC stage       9.077 0.430
 I 421 118 (28.0) 118 (28.0) 29 (6.9) 156 (37.1)   
 II 326 101 (31.0) 77 (23.6) 27 (8.3) 121 (37.1)   
 III 242 54 (22.3) 66 (27.3) 26 (10.7) 96 (39.7)   
 IV 271 74 (27.3) 71 (26.2) 19 (7.0) 107 (39.5)   
  1. UICC Union for International Cancer Control
  2. aPatients were divided into two groups according to the median age
  3. bSmoking index was defined as the number of cigarettes smoked per day × the total smoking duration (years)