Hip osteoarthritis OA is a common disabling disease, which has a much higher prevalence in Caucasians than Asians. The reasons for this ethnic difference in prevalence are unknown. Hip OA often is thought to be secondary to morphologic abnormalities. If particular abnormalities predisposing to hip OA occur more frequently in Caucasians, these differences in hip shape could account for prevalence differences.
The Caucasian race also Caucasoid  or Europid  is a grouping of human beings historically regarded as a biological taxon , which, depending on which of the historical race classifications is used, has usually included ancient and modern populations from Europe , Western Asia , Central Asia , South Asia , North Africa , and the Horn of Africa. Since the second half of the 20th century, physical anthropologists have moved away from a typological understanding of human biological diversity towards a genomic and population-based perspective, and have tended to understand race as a social classification of humans based on phenotype and ancestry as well as cultural factors, as the concept is also understood in the social sciences. This usage is considered erroneous by anthropologists and other scientists, who note that it conflates an anthropologically valid category Caucasoid with the social construct of the "white race". The conflation of Caucasian with white is also demographically misleading since the category Caucasoid includes various populations, such as South Asians and Ethiopians, that are not considered white in a social sense.
Eyelashes have been investigated far less than scalp hair, and the information available is insufficient. Lateral digital photographs of upper eyelashes were taken and curl-up and lift-up angles of upper eyelashes were measured from lateral views. Images of upper eyelashes were also taken using the phototrichogram technique and total numbers, lengths and thicknesses of upper eyelashes were obtained a total of eyelashes; for Asian, for Caucasian. The central portion of the eyelashes or whole eyelashes were clipped and images were taken immediately and 7 days later to obtain the growth rate and anagen ratio of upper eyelashes.
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