Stepwise multiple linear regressions revealed that the best predictors for CI were age and mother's education, which explained 30% of the variance. IQ level, age, and father's education were the independent predictors of PI which explained 29.4% of the variance. The best predictors for GI were age, IQ level, and mother's educational level, which explained a variance of 28.5%. It is evident from Table 4 that age was significantly associated with all oral hygiene indicators [Table 4].