Table 1.
Distribution of epidemiologic factors, breast cancer risk factors, and hair product use in the New York National Collaborative Perinatal Project (NY-NCPP) and the New York City Multiethnic Breast Cancer Project (NY-MBCP)
| Overall (N = 248) | NY-NCPP (N = 98) | NY-MBCP (N = 150) | |
|---|---|---|---|
| Mean ± SD or N (%) | Mean ± SD or N (%) | Mean ± SD or N (%) | |
| Sociodemographic factors | |||
| Age (years) | 46.8 ± 5.9 | 42.0 ± 1.8 | 49.9 ± 5.5* |
| Race/Ethnicity | |||
| Hispanic | 60 (24.2) | 37 (37.8) | 23 (15.3) |
| non-Hispanic black | 123 (49.6) | 33 (33.7) | 90 (60.0)* |
| non-Hispanic white | 65 (26.2) | 28 (28.6) | 37 (24.7) |
| Education | |||
| High school or less | 52 (21.1) | 11 (11.2) | 41 (27.5)* |
| Some college | 84 (34.0) | 37 (37.8) | 47 (31.5) |
| College or more | 11 (44.9) | 50 (51.0) | 61 (40.9) |
| Breast Cancer Risk Factors | |||
| Body Mass Index (kg/m2) | 29.0 ± 6.9 | 27.8 ± 6.8 | 29.8 ± 6.9* |
| Body Mass Index (kg/m2) | |||
| < 25 | 77 (32.1) | 37 (39.4) | 40 (27.4) |
| ≥ 25 | 163 (67.9) | 57 (60.6) | 106 (72.6) |
| Breast Percent Density (%) | 15.4 ± 12.5 | 18.9 ± 13.3 | 13.1 ± 11.4* |
| Breast Dense Area (cm2) | 20.0 ± 16.1 | 23.7 ± 17.9 | 17.5 ± 14.4* |
| Age at menarche | 12.4 ± 1.7 | 12.5 ± 1.6 | 12.3 ± 1.7 |
| Age at menarche | |||
| < 11 years | 26 (11.3) | 7 (8.9) | 19 (12.7) |
| ≥11 years | 203 (88.7) | 72 (91.1) | 131 (87.3) |
| Menopausal status | |||
| Pre/Peri-menopausal | 176 (75.5) | 79 (95.2) | 97 (64.7)* |
| Postmenopausal | 57 (24.5) | 4 (4.8) | 53 (35.3) |
| Childhood Use of Hair Products (ever use) | 106 (42.7) | 35 (35.7) | 71 (47.3) |
| Hair oils | 92 (37.1) | 29 (29.6) | 63 (42.0) |
| Hair lotions | 24 (9.7) | 13 (13.4) | 11 (7.3)* |
| Root stimulators | 3 (1.2) | – | 3 (2.0) |
| Leave-in conditioners | 20 (8.1) | 12 (12.2) | 8 (5.3) |
| Perms/relaxers | 15 (6.1) | 9 (9.2) | 6 (4.0) |
| Hair dyes | 2 (0.8) | – | 2 (1.3) |
| Overall duration of childhood use of hair oil (years) | 7.8 ± 3.1 | 7.7 ± 3.1 | 7.8 ± 3.2 |
| Adult Use of Hair Products (ever use) | 229 (92.3) | 85 (86.7) | 144 (96.0)* |
| Hair oils | 117 (47.2) | 33 (33.7) | 84 (56.0)* |
| Hair lotions | 109 (44.0) | 31 (31.6) | 78 (52.0)* |
| Root stimulators | 38 (15.3) | 9 (9.2) | 29 (19.3)* |
| Leave-in conditioners | 140 (56.5) | 54 (55.1) | 86 (57.3) |
| Perms/relaxers | 153 (61.7) | 53 (54.1) | 100 (66.7)* |
| Hair dyes | 153 (61.7) | 60 (61.2) | 93 (62.0) |
| Overall duration of adult use of hair oil (years) | 25.4 ± 7.1 | 21.4 ± 3.3 | 26.9 ± 7.7* |
*p < 0.05; represents the test for differences between cohorts