Table 1 Selected demographic and lifestyle characteristics in patients with colon or rectal cancer and their matched control subjects, the Singapore Chinese Health Study

From: Plasma fatty acids and risk of colon and rectal cancers in the Singapore Chinese Health Study

 

Colon

Rectal

 

Cases

Controls

Odds ratio (95% CI)a

P trend

Cases

Controls

Odds ratio (95% CI)a

P trend

Number of subjects

211

211

  

139

139

  

Age, mean (SD)b

59.9 (7.6)

59.9 (7.3)

–

–

59.4 (8.0)

59.2 (8.0)

–

–

Sexb

        

 Men

118

118

–

–

88

88

–

–

 Women

93

93

–

–

51

51

–

–

Level of education

        

 No formal

50

44

1.00 (Referent)

 

35

31

1.00 (Referent)

 

 Primary

107

100

0.89 (0.54, 1.48)

 

67

62

0.91 (0.46, 1.81)

 

 Secondary or higher

54

67

0.70 (0.39, 1.24)

0.179

37

46

0.62 (0.28, 1.36)

0.207

Body mass index, kg/m2

        

 <20

34

34

1.00 (Referent)

 

22

18

1.00 (Referent)

 

 20–<24

103

118

0.86 (0.50, 1.46)

 

73

73

0.81 (0.40, 1.64)

 

 24–<28

53

47

1.13 (0.61, 2.10)

 

36

37

0.79 (0.36, 1.72)

 

 ≥28

21

12

1.70 (0.75, 3.82)

0.159

8

11

0.58 (0.19, 1.80)

0.390

Cigarette smokingc

        

 Never

136

136

1.00 (Referent)

 

74

79

1.00 (Referent)

 

 Light

65

65

1.00 (0.65, 1.54)

 

57

54

1.20 (0.68, 2.09)

 

 Heavy

10

10

1.00 (0.41, 2.45)

1.00

8

6

1.52 (0.49, 4.71)

0.414

Alcohol, # drinks/week

        

 Nondrinker

165

166

1.00 (Referent)

 

109

115

1.00 (Referent)

 

 <7

34

37

0.93 (0.55, 1.57)

 

21

19

1.17 (0.60, 2.31)

 

 ≥7

12

8

1.55 (0.60, 4.02)

0.638

9

5

2.06 (0.62, 6.87)

0.249

Physical activity, h/week

        

 0

142

141

1.00 (Referent)

 

90

88

1.00 (Referent)

 

 0.5–<4

38

40

0.94 (0.56, 1.58)

 

24

30

0.80 (0.43, 1.49)

 

 ≥4

31

30

1.02 (0.58, 1.80)

1.00

25

21

1.12 (0.58, 2.19)

0.869

Diabetes

        

 No

186

190

1.00 (Referent)

 

120

130

1.00 (Referent)

 

 Yes

25

21

1.22 (0.66, 2.28)

0.528

19

9

2.11 (0.96, 4.67)

0.065

Regular NSAID used

        

 Never

193

182

1.00 (Referent)

 

119

123

1.00 (Referent)

 

 Ever

10

21

0.39 (0.16, 0.93)

0.034

17

13

1.36 (0.63, 2.97)

0.435

  1. CI confidence interval, NSAID nonsteroidal anti-inflammatory drug
  2. a Odds ratios were calculated from conditional logistic regression models
  3. b Age and sex were matching factors, thus the odds ratios and P values were not calculated
  4. c Heavy smokers were those who started to smoke cigarettes before 15 years of age and smoked at least 13 cigarettes per day. Light smokers were those who started to smoke cigarettes at or after 15 years of age or smoked 12 or less cigarettes per day
  5. d NSAID use was collected after baseline at the first follow-up questionnaire. Regular use was defined as two or more times per week for 1 month or longer
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