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Table 1 General characteristics of intrahepatic cholangiocarcinoma cases and their matched controls

From: Opisthorchiasis with proinflammatory cytokines (IL-1β and TNF-α) polymorphisms influence risk of intrahepatic cholangiocarcinoma in Thailand: a nested case-control study

Variables Cases Controls
n = 219 % n = 438 %
Sex
 Female 92 42.0 184 42.0
 Male 127 58.0 254 58.0
Age at recruitment (years)
 30–39 7 3.2 13 3.0
 40–49 34 15.5 70 16.0
 50–59 99 45.2 199 45.4
 60–69 79 36.1 156 35.6
 Median (min: max) 57 (31: 69) 57 (30: 70)
Education level
 Illiterate 26 11.9 15 3.4
 Primary school 185 84.5 398 90.9
 Secondary school or higher 8 3.7 25 5.7
Marital status
 Single 4 1.8 11 2.5
 Married 173 79.0 362 82.7
 Divorced 14 6.4 20 4.6
 Widowed 28 12.8 45 10.3
Occupation
 Farmer 195 89.0 399 91.1
 Government official 5 2.3 16 3.7
 Commercial 15 6.9 16 3.7
 General employee 4 1.8 7 1.6
Household income per year (Baht)
 Less than 60,000 (Low) 213 97.3 418 95.4
 60,001–119,999 (Medium) 4 1.8 10 2.3
  ≥ 120,000 (High) 2 0.9 10 2.3
 Median (min: max) 10,000 (1200: 120,000) 10,000 (1000: 360,000)
O. viverrini egg in stool
 Negative 115 62.2 230 62.2
 Positive 70 37.8 140 37.8