Table 2.
Intraclass correlation coefficients over 2–3 years for stress hormones among premenopausal women in the Nurses’ Health Study II.
| Analyte | Number of participants/ number of time points |
CV1 (%) |
Median (5th – 95th Percentile) |
Within- person CV |
Between- person CV |
ICC2 (95%CI) |
|---|---|---|---|---|---|---|
| Premenopausal | ||||||
|
Catecholamines, urine (µg/g creatinine) |
||||||
| Norepinephrine | 38/3 | 2.4 | 24 (11–51) | 35.7 | 28.8 | 0.38 (0.19–0.62) |
| Dopamine | 38/3 | 3.1 | 192 (113–255) | 18.2 | 16.8 | 0.45 (0.27–0.64) |
|
Free cortisol, urine (µg/g creatinine) |
38/3 | 4.5 | 17.8 (4.1–84.3) | 80.6 | 47.3 | 0.25 (0.09–0.51) |
| Free cortisol, plasma (µg/dl) | ||||||
| Follicular | 38/2 | 12.8 | 0.96 (0.30–2.39) | 60.9 | 12.0 | 0.02 (0.00–1.00) |
| Luteal | 38/2 | 10.2 | 0.99 (0.24–2.50) | 68.9 | 0.0 | 0.00 |
| Average | 38/2 | 11.5 | 1.02 (0.54–2.10) | 43.4 | 14.5 | 0.09 (0.00–0.91) |
| Total cortisol, plasma (µg/dl) | ||||||
| Follicular | 38/2 | 9.1 | 14.0 (7.00–24.0) | 34.2 | 20.4 | 0.25 (0.06–0.62) |
| Luteal | 38/2 | 7.1 | 15.0 (7.00–24.0) | 32.3 | 26.0 | 0.38 (0.16–0.66) |
| Average | 38/2 | 8.1 | 14.5 (8.50–23.0) | 24.9 | 21.0 | 0.41 (0.18–0.67) |
1
CV=coefficient of variation.
2
Urine markers adjusted for creatinine.