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Table 1 Selected characteristics of GC cases and controls

From: Irradiation-induced telomerase activity and gastric cancer risk: a case-control analysis in a Chinese Han population

Variables

cases (n= 246)

controls (n= 246)

p a

Sex, n (%)

   

   Male

175 (71)

175 (71)

 

   Female

71 (29)

71 (29)

1.000

Smoking status, n (%)

   

   Never

110 (45)

145 (59)

 

   Ever

136 (55)

101 (41)

0.002

Drinking status, n (%)

   

   Never

121 (49)

147 (60)

 

   Ever

125 (51)

99 (40)

0.019

Hp antibody positivity, n (%)

   

   Yes

167 (68)

128 (52)

 

   No

79 (32)

118 (48)

<0.001

Mean age, years (SD)

60.1 (11.2)

59.8 (10.8)

0.375

Mean pack-years (SD)c

42.8 (27.3)

27.1(16.5)

<0.001

  1. SD: standard deviation.
  2. a p values were derived from the Pearson χ2 test for categorical variables (sex, Hp antibody positivity, smoking status and drinking status ) and Student's t test for continuous variables (age and cigarette smoking pack-years).
  3. b Ever smokers only.