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’seducational level, which explained a variance of 28.5%.
It is evident from Table 4 that age was significantly
associated with all oral hygiene indicators