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Table 1 Distribution of subjects by sex, ethnicity, and history of tobacco use

From: Macular pigment optical density in a Brazilian sample

Variable Frequency (n = 103) %
Sex
Female 66 64.1
Male 37 35.9
Ethnicity
White 30 29.1
Black 25 24.3
Biracial 48 46.6
Tobacco use
Yes 22 21.3
No 81 78.7