Levels of urinary 6β-OHC:cortisol ratios for cases and controls, Shanghai Breast Cancer Study, 1996–98
Urinary cortisol ratios | |||||
---|---|---|---|---|---|
Case | Control | Percentage differencea | Pb | ||
All of the subjects (246 pairs)c | |||||
Mean ± SD | 3.03 ± 1.88 | 2.54 ± 1.68 | 19.3 | 0.001 | |
Median (25th, 75th percentile) | 2.61 (1.63, 3.92) | 2.16 (1.32, 3.28) | 20.8 | <0.001 | |
Age ≤45 years (102 pairs)c | |||||
Mean ± SD | 2.95 ± 1.89 | 2.72 ± 1.66 | 8.5 | 0.33 | |
Median (25th, 75th percentile) | 2.49 (1.53, 3.85) | 2.35 (1.48, 3.59) | 6.0 | 0.45 | |
Age >45 years (144 pairs)c | |||||
Mean ± SD | 3.10 ± 1.88 | 2.42 ± 1.68 | 28.1 | <0.001 | |
Median (25th, 75th percentile) | 2.64 (1.74, 3.99) | 2.01 (1.24, 2.95) | 31.3 | <0.001 |
a Expressed as (meancases − meancontrols)/meancontrols or (mediancases − mediancontrols)/mediancontrols.
b Ps were from paired t-test of log-transformed data (for mean comparisons) or the Wilcoxon signed rank test (for median comparisons).
c Case-control pairs.