Chewing of betel quid is a relatively common habit, especially among older women. Although only 22.1% of all control subjects were chewers, it was 35.9% among women, and all were over the age of 55. Ever chewers had a 4.11-fold (95%CI=2.16-7.78, p-value <0.001) increased risk when compared with never chewers in univariate analysis. There is a strong relationship with the duration of chewing (P for trend <0.001). We also found red lime conveyed the strongest risk factor among all components of the betel quid (OR=10.67, 95%CI=2.27-50.08).
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