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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

From: Betel nut chewing and incidence of newly diagnosed type 2 diabetes mellitus in Taiwan.

Age (years) Total Current chewers Ex-chewers Never-chewers Prevalence rate of ever chewers (%) Odds ratio (95% confidence interval)
      Present study Referent study Ever chewers vs. Never-chewers Current 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)
  1. *P < 0.001 by Chi-square test comparing the prevalence rates of betel nut chewing between the diabetic patients in the present study and the general population in the referent study (reference [8])