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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