Frequency of color blindness among Nigerian school children in Lagos

Article Abstract:

The frequencies of red-green color blindness among Black Africans and Black Americans are lower than among Caucasians. A study administered to 5,580 boys and 5,580 girls in primary and secondary school in Lagos showed that the frequency of total color-blindness between genders was not significantly different. However, the frequencies of red-green color blindness were significantly different.

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Permanent tooth emergence among Zambian schoolchildren: a standard for the assignment of ages

Article Abstract:

The mean age per number of permanent teeth as a standard to determine the age of rural Zambian children is supportable. The age estimates were compared against known ages in a sample of 543 Zambian schoolchildren. The standard allows the child to be assigned an age based on the total number of permanent teeth.

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Increased tooth crown size in females with twin brothers: evidence for hormonal diffusion between human twins in utero

Article Abstract:

Issues of hormonal diffusion in utero are discussed. Research provides evidence for diffusion of sex hormones from male to female co-twins as indicated by the masculinization of the females, observed as an increase in size of the maxillary canine. These results were not duplicated in male twins.

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