Table 1 Comparison of current smoking prevalence and odds ratios among subgroups

From: Association between smoking and deaths due to colorectal malignant carcinoma: a national population-based case–control study in China

 

Control (%)

Case (%)

Crude OR (95% CI)

Age-adjusted OR (95% CI)

Urban men

30

632 (60.60)

316 (57.28)

0.872 (0.663–1.147)

0.888 (0.668–1.181)

40

718 (57.80)

359 (57.94)

1.006 (0.778–1.300)

1.007 (0.779–1.301)

50

2110 (59.38)

1055 (58.96)

0.983 (0.845–1.142)

0.985 (0.848–1.146)

60

3076 (59.23)

1538 (61.70)

1.109 (0.978–1.257)

1.110 (0.979–1.258)

70

3738 (50.59)

1869 (53.34)

1.117 (0.999–1.248)

1.136 (1.016–1.270)

Subtotal

10 274 (56.10)

5137 (57.56)

1.061 (0.992–1.136)

1.063 (0.993–1.137)

Urban women

30

712 (2.53)

356 (1.97)

0.773 (0.320–1.869)

0.809 (0.334–1.960)

40

796 (7.04)

398 (8.29)

1.195 (0.763–1.870)

1.201 (0.766–1.883)

50

1970 (16.40)

985 (15.43)

0.930 (0.754–1.148)

0.935 (0.758–1.154)

60

2606 (20.11)

1303 (20.57)

1.029 (0.872–1.213)

1.019 (0.863–1.202)

70

3894 (18.88)

1947 (21.62)

1.186 (1.037–1.356)

1.222 (1.067–1.400)

Subtotal

9978 (16.60)

4989 (17.66)

1.078 (0.985–1.179)

1.065 (0.973–1.166)

Rural men

30

186 (72.04)

93 (58.06)

0.537 (0.319–0.905)

0.523 (0.309–0.886)

40

282 (68.09)

141 (65.25)

0.880 (0.574–1.350)

0.863 (0.561–1.326)

50

586 (68.09)

293 (70.99)

1.147 (0.844–1.558)

1.147 (0.845–1.559)

60

916 (65.83)

458 (77.73)

1.812 (1.398–2.347)

1.807 (1.394–2.342)

70

1078 (54.55)

539 (61.97)

1.357 (1.099–1.677)

1.383 (1.118–1.711)

Subtotal

3048 (62.86)

1524 (68.50)

1.285 (1.128–1.464)

1.294 (1.134–1.475)

Rural women

30

146 (0.68)

73 (4.11)

6.214 (0.635–60.821)

5.186 (0.523–51.445)

40

210 (3.81)

105 (4.76)

1.263 (0.403–3.959)

1.218 (0.387–3.832)

50

440 (7.50)

220 (8.18)

1.099 (0.604–2.000)

1.097 (0.603–1.997)

60

708 (8.90)

354 (9.89)

1.123 (0.728–1.735)

1.085 (0.701–1.680)

70

1080 (10.65)

540 (11.67)

1.108 (0.800–1.536)

1.166 (0.839–1.619)

Subtotal

2584 (8.51)

1292 (9.60)

1.141 (0.906–1.437)

1.128 (0.895–1.422)

  1. Abbreviations: CI=confidence interval; OR=odds ratio.