Table 3.
Linear regression of childhood and adult hair product use and mammographic breast density in the New York National Collaborative Perinatal Project (NY-NCPP) and the New York City Multiethnic Breast Cancer Project (NY-MBCP)
| Overalla | NY-NCPPb | NY-MBCPb | |
|---|---|---|---|
| β (95% CI) | β (95% CI) | β (95% CI) | |
| Percent Density | |||
| Childhood use | 0.004 (−0.23, 0.24) | 0.12 (−0.25, 0.49) | −0.08 (−0.38, 0.22) |
| Hair oils | −0.04 (−0.28, 0.20) | 0.07 (−0.33, 0.46) | −0.14 (−0.44, 0.16) |
| Other Products | 0.07 (−0.23, 0.36) | 0.13 (−0.28, 0.54) | −0.06 (−0.47, 0.35) |
| Dense Area | |||
| Childhood use | 0.03 (−0.19, 0.26) | 0.15 (−0.21, 0.51) | −0.05 (−0.33, 0.23) |
| Hair oils | −0.04 (−0.27, 0.19) | 0.07 (−0.31, 0.45) | −0.13 (−0.41, 0.16) |
| Other Products | 0.09 (−0.18, 0.37) | 0.16 (−0.23, 0.55) | −0.02 (−0.41, 0.37) |
| β (95% CI) | β (95% CI) | β (95% CI) | |
| Percent Density | |||
| Adult use | 0.34 (−0.09, 0.77) | 0.44 (−0.07, 0.95) | 0.03 (−0.70, 0.76) |
| Hair oils | 0.08 (−0.15, 0.32) | 0.02 (−0.37, 0.41) | 0.03 (−0.27, 0.33) |
| Other Products | 0.41 (0.02, 0.79) | 0.49 (−0.001, 0.98) | 0.22 (−0.38, 0.82) |
| Dense Area | |||
| Adult use | 0.35 (−0.06, 0.76) | 0.45 (−0.05, 0.95) | 0.06 (−0.64, 0.75) |
| Hair oils | 0.06 (−0.16, 0.28) | −0.10 (−0.48, 0.27) | 0.08 (−0.20, 0.36) |
| Other Products | 0.41 (0.04, 0.78) | 0.55 (0.07, 1.02) | 0.17 (−0.41, 0.74) |
All models are ‘ever’ compared to ‘never’ product use. All models were run separately for each exposure and are not mutually adjusted for each other
aAll models are adjusted for age at interview (continuous), cohort (NY-NCPP or NY-MBCP), and BMI (continuous)
bAll models are adjusted for age at interview (continuous) and BMI (continuous)