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Table 3 Age-specific incidence rates (per 100,000 population) and incidence rate ratios (RR) for newly diagnosed type 2 diabetes mellitus for ever chewers vs. never-chewers during the years 1992-1996

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

Year Age (years) Observed incident case Incidence rate* Incidence RR (Ever chewers vs. never-chewers)
   Ever chewers Never-chewers Ever chewers Never-chewers  
1992 < 40 11 33 3.6 2.9 1.25
  40-49 66 152 229.1 89.6 2.56
  50-59 107 326 1145.6 241.3 4.75
  60-69 140 547 6997.8 423.5 16.52
  ≥70 64 428 627.3 700.5 0.90
1993 < 40 19 39 6.2 3.4 1.83
  40-49 83 235 272.0 130.7 2.08
  50-59 209 494 2228.8 364.2 6.12
  60-69 216 774 10717.2 594.9 18.02
  ≥70 96 661 882.8 1015.0 0.87
1994 < 40 31 68 10.1 5.9 1.71
  40-49 170 384 524.6 201.2 2.61
  50-59 259 652 2747.8 478.3 5.75
  60-69 259 951 12791.4 727.5 17.58
  ≥70 99 790 853.3 1137.0 0.75
1995 < 40 48 126 15.7 11.0 1.43
  40-49 207 459 599.3 225.6 2.66
  50-59 241 682 2580.6 504.9 5.11
  60-69 206 877 10288.9 678.5 15.16
  ≥70 84 668 680.9 904.2 0.75
1996 < 40 92 218 30.2 19.1 1.58
  40-49 193 549 520.9 251.5 2.07
  50-59 239 764 2566.9 567.3 4.52
  60-69 231 922 11672.8 721.7 16.17
  ≥70 83 766 630.3 971.4 0.65
  1. *The nominators for the incidence rates are the observed incident case number multiplied by a correction factor of 5.74 (please refer to the section 'Methods') and the denominators are the respective age-specific mid-year population of the male-sex in the specific year.