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Table 3 Logistic regression of smoking and tooth discolouration

From: Smoking and tooth discolouration: findings from a national cross-sectional study

   P Value OR 95% CI**
Smokers Mild 0.54 0.94 0.78 1.13
  Moderate 0.00* 1.76 1.40 2.22
  Severe 0.00* 2.43 1.76 3.34
  1. * Statistically significant at 0.05 level
  2. ** Confidence Interval
  3. Age, sex and income were adjusted for in the regression. Non-smokers is the reference