Table 2 Age-specific case numbers of all diabetic men by betel nut chewing in the present study, prevalence of betel nut ever chewers, and the estimated odds ratios for type 2 diabetes mellitus for ever chewers vs. never-chewers

< 40

1474

327

88

1059

28.2

26.9

1.06 (0.92-1.23)

1.53 (1.30-1.81)

40-49

5231

1064

497

3670

29.8

21.0*

1.60 (1.45-1.76)

2.03 (1.80-2.29)

50-59

8447

1366

869

6212

26.5

14.5*

2.12 (1.88-2.39)

2.31 (1.99-2.69)

60-69

11891

1142

1218

9531

19.8

6.5*

3.58 (3.10-4.13)

3.24 (2.66-3.93)

≥70

10183

395

619

9169

10.0

1.5*

7.14 (5.47-9.31)

6.29 (4.20-9.43)

Total

37226

4294

3291

29641

20.4

14.3*

1.53 (1.45-1.61)

1.60 (1.50 -1.71)