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Table 2 Multiple Poisson regression of association among independent variable and dental caries (DMFT)

From: Reliability of self-reported toothbrushing frequency as an indicator for the assessment of oral hygiene in epidemiological research on caries in adolescents: a cross-sectional study

Oral hygiene variables Model 1 Model 2 Model 3 Model 4 Model 5 Model 6
RR [CI] p* RR [CI] p* RR [CI] p* RR [CI] p* RR [CI] p* RR [CI] p*
Toothbrush Frequency             
 ≤ twice a day 2.67       2.80   2.79   2.83  
  [2.19-3.26]       [2.26-3.45]   [2.23-3.48]   [2.26-3.54]  
 More than twice a day 1 <0.001      1 <0.001 1 <0.001 1 <0.001
Simplified Oral Hygiene Index             
 Unsatisfactory    1.31     0.90     0.92  
    [1.11-1.54]     [0.77-1.05]     [0.77-1.08]  
 Satisfactory    1 <0.001    1 0.190    1 0.301
Visible Plaque Index             
 Present      1.48     0.921   0.96  
      [1.23-1.76]     [0.78-1.09]   [0.80-1.16]  
 Absent      1 <0.001    1 0.347 1 0.686
  1. *Significance evaluated by Multiple Poisson regression. RR: Rate ratio adjusted by gender, mother’s level of education, household income, sugar intake, mutans streptococci and lactobacilli. CI: 95% confidence interval. Results significant at the 5% level marked in bold.