TABLE 1.
Descriptive statistics for key study variables
| Sample size | Mean (SD) or frequency (%) | |
|---|---|---|
| Biologic sex | 72 | |
| Males | 39 | 54.2% |
| Females | 33 | 45.8% |
| Race/ethnicity | 72 | |
| Black or African American, non‐Hispanic | 20 | 27.7% |
| White or Caucasian, non‐Hispanic | 48 | 66.7% |
| Other | 4 | 5.6% |
| Mother's education status | 72 | |
| High School Graduate or below | 4 | 6.2% |
| College and post‐graduate education | 61 | 84.1% |
| No response | 7 | 9.7% |
| Father's education status | 72 | |
| High School Graduate or below | 12 | 19% |
| College and post‐graduate education | 51 | 68.5% |
| No response | 9 | 12.5% |
| Age in years | 72 | 12.46 (2.31) |
| Raw cortisol concentrations (μg/dl) | ||
| Sample 1 (−30 min pre‐TSST) | 72 | 0.13 (0.06) |
| Sample 2 (0 min pre‐TSST) | 72 | 0.11 (0.05) |
| Sample 3 (20 min post‐TSST) | 72 | 0.15 (0.10) |
| Sample 4 (35 min post‐TSST) | 72 | 0.12 (0.07) |
| Sample 5 (60 min post‐TSST) | 72 | 0.09 (0.05) |
| Raw alpha amylase concentrations (U/ml) | ||
| Sample 1 (−30 min pre‐TSST) | 72 | 163.4 (107.0) |
| Sample 2 (0 min pre‐TSST) | 72 | 185.9 (136.0) |
| Sample 3 (20 min post‐TSST) | 72 | 237.8 (160.8) |
| Sample 4 (35 min post‐TSST) | 72 | 209.0 (166.4) |
| Alpha amylase AUC i | 72 | 2205 (5306) |
| Heart rate variability (age‐detrended) | ||
| Pre‐TSST resting state | 65 | −0.049 (0.13) |
| Preparation (TSST) | 67 | −0.59 (0.16) |
| Story (TSST) | 67 | −0.18 (0.15) |
| Math (TSST) | 57 | −0.14 (0.13) |
| Post‐TSST resting state | 60 | −0.055 (0.15) |
| Pubertal status (PDS score) | 72 | 7.83 (3.04) |
Note: Adolescent sex coded male = 0, female = 1.
Abbreviation: TSST, Trier Social Stress Test.