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Table 4 Adjusted prevalence ratios of good to excellent self-rated dental health

From: Self-rated dental health and dental insurance: modification by household income

  PR (95% CIs) P
Sex
 Male 0.91 (0.85–0.99) 0.024
 Female (ref.)    .
Age group
 30 – 39 (ref.) -   
 40 – 49 1.00 (0.92–1.09) 0.968
 50 – 61 0.89 (0.82–0.98) 0.012
Tooth brushing
 Less than twice a day (ref.) -   
 Twice a day or more 1.14 (1.05–1.22) 0.001
Income group
 <$40 000 0.59 (0.49–0.72) <.000
 $40 000– < $80 000 0.78 (0.66–0.91) 0.002
 $80 000– < $120 000 0.84 (0.71–1.00) 0.051
 $120 000+ (ref.) -   .
Dental insurance
 Insured 0.96 (0.85–1.11) 0.627
 Uninsured (ref.) -   .
Interaction
 Insured × < $40 000 1.33 (1.00–1.77) 0.051
 Insured × $40 000– < $80 000 1.21 (1.01–1.46) 0.043
 Insured × $80 000– < $120 000 1.12 (0.92–1.36) 0.260
  1. Notes:
  2. PR: Prevalence Ratios.
  3. Ref: reference category.
  4. Omnibus test p < 0.000.