tBRor 13 taken together in the two surveys. A separate analysis for the three kinds of school is also given, but with few excep- tions the differences between them were not large. A total of 14.6% of the teeth in 1947 were carious, whereas for 1950 the figure was 13.9%. Comparative figures for caries incidence in other groups of children are given.
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Watson et al. (1952) studied this question.
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