Pilot performance during a terrain following flight was studied for ride quality criteria validation. Ride qualities criteria validation/ pilot performance study: Flight test results If replicated, these results suggest that hair product use may be important to measure in evaluating earlier age at menarche. Childhood hair oil and perm use were associated with earlier menarche. Other types of hair products assessed in this study were not associated with earlier menarche. Hair perm users had an increased risk for earlier menarche (adjusted risk ratio = 1.4, 95% CI: 1.1-1.8). Women reporting childhood hair oil use had a risk ratio of 1.4 (95% confidence interval : 1.1-1.9) for earlier menarche, adjusting for race/ethnicity and year of birth. African-Americans were more likely to use hair products and reached menarche earlier than other racial/ethnic groups. ≥12), adjusting for potential confounders. We used multivariable binomial regression to evaluate the association between hair product use and age at menarche (<12 vs. Recalled age at menarche ranged from 8 to 19 years. Data were collected retrospectively on hair oil, lotion, leave-in conditioner, perm, and other types of hair products used before age 13. ![]() We recruited 300 African-American, African-Caribbean, Hispanic, and white women from the New York City metropolitan area who were between 18-77 years of age. We evaluated the association between childhood hair product use and age at menarche in a racially diverse study population. Previous studies suggest that hair products containing endocrine disrupting chemicals could alter puberty. James-Todd, Tamarra Terry, Mary Beth Rich-Edwards, Janet Deierlein, Andrea Senie, Ruby ![]() Childhood hair product use and earlier age at menarche in a racially diverse study population: a pilot study.
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