Table 2.
Binomial regression of childhood hair product use and age at menarche (<11 vs. ≥11 (referent) years) in the New York National Collaborative Perinatal Project (NY-NCPP) and the New York City Multiethnic Breast Cancer Project (NY-MBCP)
| n < 11/≥11 | Age and cohort adjusteda | Age, cohort, and race/ethnicity adjustedb | |
|---|---|---|---|
| RR (95% CI) | RR (95% CI) | ||
| Childhood use | |||
| Never use | 10/125 | 1.00 | 1.00 |
| Ever use | 16/78 | 2.26 (1.05, 4.85) | 1.79 (0.79, 4.07) |
| Hair oils | |||
| Never use | 11/137 | 1.00 | 1.00 |
| Ever use | 15/66 | 2.47 (1.16, 5.25) | 2.32 (0.98, 5.48) |
| Other products | |||
| Never use | 19/169 | 1.00 | 1.00 |
| Ever use | 7/33 | 1.78 (0.80, 3.94) | 1.45 (0.65, 3.22) |
The model is adjusted for age at interviewa, b (continuous), cohorta, b (NY-NCPP or NY-MBCP), and race ethnicity b (Hispanic, non-Hispanic black, non-Hispanic white)