in an attempt to examine the validity of the variability hypothesis, while avoiding intervening social and cultural factors, hollingworth gathered data on birth weight and length of 1,000 male and 1,000 female newborns. this research found virtually no difference in the variability of male and female infants, and it was concluded that if variability "favoured" any sex it was the female sex. additionally, along with the anthropologist robert lowie, hollingworth published a review of literature from anatomical, physiological, and cross-cultural studies, in which no objective evidence was found to support the idea of innate female inferiority.