Table 5 Multivariate analysis: model of risk factors for the occurrence of BS. Dependent variable: presence of BS in at least two teeth.

From: Risk factors for the presence of dental black plaque

Independent variable Estimated OR Significance level 95% CI
Salivary iron 0.975 0.018 0.955–0.996
Tap/osmosis drinking water 13.126 0.001 2.948–58.441