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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)