FIG. 3.

Effect of S. mutans infection on caries experience in preschool children with regard to serotype. A, subjects scoring 0 with Dentocult SM kit (n = 218); B, subjects with a monoinfection by a single serotype (n = 158); C, subjects with a mixed infection by multiple serotypes (n = 11). Vertical bars represent standard error. Differences in caries experience among the groups were analyzed by the Kruskal-Wallis test (P < 0.001). **, significant difference according to the Steel multiple-comparison test (P < 0.01).