Table 2

Levels of urinary 6β-OHC:cortisol ratios for cases and controls, Shanghai Breast Cancer Study, 1996–98

Urinary cortisol ratios
CaseControlPercentage differenceaPb
All of the subjects (246 pairs)c
 Mean ± SD3.03 ± 1.882.54 ± 1.6819.30.001
 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 ± SD2.95 ± 1.892.72 ± 1.668.50.33
 Median (25th, 75th percentile)2.49 (1.53, 3.85)2.35 (1.48, 3.59)6.00.45
Age >45 years (144 pairs)c
 Mean ± SD3.10 ± 1.882.42 ± 1.6828.1<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.