TABLE 1.
Raw Data and Demographic Characteristics of Samples
| T0 | T1 | T2 | T3 | |
|---|---|---|---|---|
| HC (pg/mg), mean (SD) | 7.46 (8.97) | 5.81 (6.85) | 4.59 (5.18) | 4.66 (3.51) |
| HE (pg/mg), mean (SD) | 11.6 (8.84) | 9.89 (8.52) | 9.03 (6.32) | 9.59 (6.84) |
| HC/DHEA (ratio), mean (SD) | 7.85 (13.21) | 6.07 (7.83) | 4.77 (5.28) | 5.49 (6.27) |
| PSS (summary score), mean (SD) | 14.1 (5.9) | 13.4 (5.9) | 13.2 (6.0) | 12.5 (6.1) |
| TICS (global stress score), mean (SD) | 15.0 (6.9) | 13.8 (7.4) | 13.8 (7.8) | 13.1 (7.7) |
| HC/HE sample | ||||
| n (% female) [comparison to sample without HC/HE measures] | 177 (68.4) [χ2 = 26.5, df = 1, p < .001] | 155 (63.2) [χ2 = 3.35, df = 1; p = .07] | 131 (59.5) [χ2 = 0.08, df = 1, p > .5] | 146 (64.4) [χ2 = 9.8, df = 1, p = .002] |
| Age (yrs), mean (SD)[comparison to sample without HC/HE measures] | 39.6 (9.35) [t(330) = 2.42, p = .016] | 39.1 (9.49) [t(330) = 3.13, p = .002] | 39.4 (9.71) [t(249) = 2.64, p = .009] | 39.7 (9.74) [t(249) = 2.39, p = .018] |
| Smoker, n (%) | 21 (11.9) | 12 (7.7) | 11 (8.4) | 15 (10.3) |
| PSS/TICS sample | ||||
| n (% female) | 322 (59.6) | 311 (59.5) | 233 (59.2) | 226 (58.4) |
| Age (yrs), mean (SD) | 40.7 (9.22) | 40.7 (9.27) | 40.6 (9.35) | 40.6 (9.45) |
| Smoker, n (%) | 38 (11.8) | 37 (11.9) | 30 (12.9) | 28 (12.4) |
| HC/DHEA subsample | ||||
| n (% female) | 143 (65.0) | 126 (59.5) | 108 (53.7) | 121 (62.0) |
| Age (yrs), mean (SD) | 39.4 (9.30) | 38.4 (9.53) | 38.3 (9.91) | 39.1 (9.81) |
| Smoker, n (%) | 18 (12.6) | 9 (7.1) | 9 (8.3) | 12 (9.9) |
HC = hair cortisol; HE = hair cortisone; HC/DHEA = hair cortisol to dehydroepiandrosterone ratio; PSS = Perceived Stress Scale; TICS = Trier Inventory for Chronic Stress; T0–3, time points 0–3; SD = standard deviation.
“HC/HE sample” refers to participants with at least one usable sample of either HC or HE at the given time point; “TICS/PSS sample” refers to participants with at least one self-report rating; “HC/DHEA subsample” refers to the subsample of participants with both HC and DHEA data. More older men than women had short hair or were bald, presumably leading to the higher percent of women in the HC/HE sample. Statistical analysis confirmed that participants providing hair samples were younger and more female compared with those who did not; however, they did not differ on PSS or TICS scores at any time point. For further details on the demographic characteristics of the sample, see (53). Baseline associations are described in the Supplemental Material, Supplementary Results A, http://links.lww.com/PSYMED/A759.