Table 1.
Descriptive information of the study sample
| Full Sample (N = 141) | White (n = 72) | African American (n = 69) | t or χ2 | |
|---|---|---|---|---|
| Age, years | 45.77 (15.17) | 42.35 (15.04) | 49.33 (14.58) | −2.80** |
| Sex, n female (%) | 95 (67) | 41 (57) | 54 (78) | 7.28** |
| Annual household income, n ≥ $40,000/year (%) | 77 (55) | 48 (67) | 29 (42) | 8.63** |
| Hair washes/week | 3.10 (2.27) | 4.60 (2.01) | 1.54 (1.24) | 10.91*** |
| Hair Treatment Use | ||||
| Conditioner, n yes (%) | 112 (79) | 51 (71) | 61 (88) | 6.66* |
| Bleach, n yes (%) | 19 (14) | 8 (11) | 11 (16) | 0.71 |
| Permanent Wave, n yes (%) | 23 (16) | 1 (1) | 22 (32) | 24.00*** |
| Straightening, n yes (%) | 34 (24) | 5 (7) | 29 (42) | 24.70*** |
| Days of ≥ 30 min physical activity/week | 3.48 (2.09) | 4.13 (1.92) | 2.81 (2.06) | 3.92*** |
| Waist to hip ratio | 0.88 (0.09) | 0.87 (0.08) | 0.89 (0.09) | −1.33 |
| Emotional stability | 5.20 (1.32) | 5.20 (1.21) | 5.19 (1.43) | 0.06 |
| Perceived stress | 1.21 (0.72) | 1.17 (0.71) | 1.26 (0.75) | −0.80 |
| Perceived everyday discrimination | 10.06 (4.38) | 9.54 (3.22) | 10.61 (5.29) | −1.44 |
| Hair cortisol concentration, pg/mg, median (IQR) | 7.7 (16.6) | 6.0 (7.2) | 8.6 (21.2) | −2.27* |
Note. All data provided as mean (standard deviation) unless indicated otherwise. Group comparisons were performed using
t-tests for continuous variables and Pearson chi-square tests for categorical variables. IQR = interquartile range.
*
p < 0.05;
**
p < 0.01;
***
p < 0.001.