Table 1.
Descriptive statistics: demographics, cortisol, and HRV measures.
| M (n) | SD (%) | |
|---|---|---|
| Demographics | ||
| Age (8–18) | 12.69 | 2.05 |
| Female | (90) | (44.8%) |
| Adrenarche | ||
| Stage 0 | (14) | (7.0%) |
| Stage 1 | (33) | (16.4%) |
| Stage 2 | (23) | (11.4%) |
| Stage 3 | (37) | (18.4%) |
| Stage 4 | (49) | (24.4%) |
| Stage 5 | (45) | (22.4%) |
| BMI Z-score (−3.00 to 2.60) | 0.49 | 0.97 |
| Normal weight | (136) | (67.7%) |
| Overweight | (39) | (19.4%) |
| Obese | (22) | (10.9%) |
| Parental education (0–22 years) | 16.37 | 3.37 |
| Household income ($5K–210K CAN) | 78.9K | 52.4K |
| Perceived stress score (0–40) | 15.56 | 6.87 |
| Cortisol measures | ||
| AUCAG | 11.25 | 5.40 |
| AUCI | 2.31 | 5.38 |
| SlopeMax. | −1.05 | 0.51 |
| Maximum | 18.38 | 8.04 |
| HRV measures | ||
| LF (ms2) | 2061.99 | 1083.13 |
| HF (ms2) | 1656.49 | 1189.40 |
| LF/HF ratio | 1.63 | 0.79 |
Note: N = 201. AUCAG = area under curve relative to ground. AUCI = area under curve relative to increase. SlopeMax = diurnal slope anchored to max sample using regression. LF = low frequency. HF = high frequency.