Data from "The Lincoln Dental Caries Study" (Steinberg et al., JADA, 1973). Caries comparison between a mentally subnormal, institutionalized , (MS) population compared to the local public high school (PHS).
MS population Public H.S. "p" value
Number of subjects 500 100
Age 17 17
Number of Permanent teeth 24.8 27.9 <0.001
Number of missing teeth 1.9 0.9 <0.01
Number of unerupted teeth 1.2 0.05 <0.001
DMFS 4.7 19.7 <0.01
DMFT 5.9 10.2 <0.001
Delta DMFT 3.6 3.5 N.S.
Delta DMFS 1.4 1.6 N.S.

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