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Table 1 Demographic variables in the case and control groups

From: Is opium use associated with an increased risk of lung cancer? A case-control study

Variable Lung Cancers Matched Controls P-value*
N 140 280
Gender
 Male 96 (68.57) 192 (68.57) 1.0
 Female 44 (31.43) 88 (31.43)  
Marital status
 Married 135 (96.43) 273 (97.50) 0.53
 Single 5 (3.57) 7 (2.50)  
Age
  ≤ 50 35 (25.0) 78 (27.86) 0. 63
 51–70 85 (60.71) 170 (60.71)  
 > 70 20 (14.29) 32(11.43)  
Education
 Illiterate or Elementary Education 87 (62.14) 68 (24.29) 0.001
 Middle or High school 42 (30.0) 138 (49.22)  
 High School Diploma or above 11 (7.86) 74 (26.43)  
  1. *P-values calculated according to McNemar’s test