The oral conditions of 1,993 young adults, 16-30 years old, constituting a statistically representative random sample of the population of Strasbourg, were studied. Plaque, calculus, and gingival indices were determined as well as DMFT and DMFS caries indices. All these indices showed a highly statistically significant linear correlation with age. Sex had a significant influence on caries indices but not on plaque, calculus, or gingival indices. Socioprofessional conditions had a very significant influence on caries and gingival indices but not much on plaque index and not at all on calculus index.
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Cahen et al. (1977) studied this question.
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