Variables traditionally considered as important factors in the development of S-ECC were entered into bivariate and multivariate logistic regressions (Table 3) to control for confounding or heterogeneity. Test ⁄ control group, age of the child at examination, and one ⁄ both parents family structure were significant variables in bivariate and multivariate logistic regression analyses to explain S-ECC among examined children. With the test group as reference (0), the adjusted odds ratio for developing S-ECC in the control group was 6.8 (95% CI 2.1–21.9). Each unit increase in the age of the child (months) at examination increased the odds for developing S-ECC 1.3 (95%CI 1.1–1.5) times. With both parent families as the reference group (0), one-parent families had higher odds, 3.3 (95% CI 1.2–8.8), for developing S-ECC.