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Table 3 Multivariable association between individual income and periodontitis in the entire sample, stratified by interdental brushing behavior and age

From: The use of an interdental brush mitigates periodontal health inequalities: the Korean National Health and nutrition examination survey (KNHANES)

 Odds ratio (95% confidence interval)
TotalInterdental brush use
NonusersUsers
Model 1N = 13,625N = 10,904N = 2,721
Low1.347 (1.148–1.581)1.357 (1.145–1.608)1.318 (0.945–1.838)
Middle low1.244 (1.076–1.438)1.196 (1.022–1.399)1.391 (1.018–1.901)
Middle high1.059 (0.918–1.222)1.054 (0.898–1.236)1.069 (0.781–1.464)
HighReferenceReferenceReference
Model 2N = 13,621N = 10,901N = 2,720
Low1.258 (1.070–1.478)1.255 (1.056–1.492)1.240 (0.890–1.727)
Middle low1.175 (1.015–1.361)1.139 (0.971–1.337)1.345 (0.980–1.844)
Middle high1.027 (0.888–1.187)1.031 (0.878–1.212)1.010 (0.739–1.383)
HighReferenceReferenceReference
Model 3N = 12,427N = 9,883N = 2,544
Low1.266 (1.066–1.502)1.276 (1.061–1.533)1.193 (0.839–1.696)
Middle low1.154 (0.986–1.352)1.113 (0.934–1.326)1.351 (0.976–1.868)
Middle high1.057 (0.907–1.232)1.074 (0.906–1.274)1.011 (0.736–1.390)
HighReferenceReferenceReference
Model 3 (19–64 yrs. group)N = 9,843N = 7,609N = 2,234
Low1.276 (1.050–1.549)1.301 (1.052–1.608)1.154 (0.793–1.681)
Middle low1.160 (0.965–1.394)1.120 (0.914–1.372)1.324 (0.931–1.883)
Middle high1.055 (0.881–1.263)1.076 (0.879–1.316)1.001 (0.704–1.422)
HighReferenceReferenceReference
Model 3 (over 65 yrs)N = 2,584N = 2,274N = 310
Low1.109 (0.830–1.483)0.988 (0.967–1.011)1.392 (0.566–3.425)
Middle low1.064 (0.808–1.402)1.062 (0.781–1.444)1.688 (0.806–3.532)
Middle high1.058 (0.821–1.363)1.058 (0.805–1.391)1.009 (0.530–1.921)
HighReferenceReferenceReference
  1. Response variable: Periodontitis
  2. Explanatory variable: Individual income
  3. Model 1 was adjusted to socioeconomic status variables (sex, age, level of education)
  4. Model 2 was additionally adjusted to personal health practice variables (smoking, toothbrushing, dental flossing, dental clinic visiting)
  5. Model 3 was additionally adjusted to systematic medical factor variables (diabetes mellitus, hypercholesterolemia, hypertension, obesity)
  6. P-values highlighted in bold are statistically significant (p = 0.05)