The National Longitudinal Study of Adolescent Health (Add Health) is "a longitudinal study of a nationally representative sample of adolescents in grades 7-12 in the United States during the 1994-95 school year.
The Add Health cohort has been followed into young adulthood with four in-home interviews, the most recent in 2008, when the sample was aged 24-32".
Among other variables it has measured the physical attractiveness of the participants.
Psychologist Satoshi Kanazawa in a 2011 article analyzed the data.
Women were generally more physically attractive than men.
White men and White women were rated the most physically attractive.
The statistically significant racial difference was the lower physically attractiveness for Black women than for other women.
The average results for the different races and sexes are presented below with 0 as the average result for the whole group and 1 as one standard deviation.
Higher values indicate higher physical attractiveness. In contrast, when the participants were asked to judge their own individual physical attractiveness, both Black men and Black women rated themselves as far more physically attractive than men and women of other races.
The self-reported average physical attractiveness score for Blacks were about double those of other races.
Kanazawa argued that the White and Black men in the studied group did not differ significantly on BMI which is a measure of obesity.
Black and White women differed somewhat with average BMIs of 28.5 and 26.1.
However, the Black women were still less physically attractive after controlling for this difference.
Higher IQ has a relationship with higher physical attractiveness which could be an explanation due to the differences regarding race and intelligence.