Table 1

99% Confidence intervals (CIs) of the Δδ13C values for each surveyed country calculated by the addition of the mean value and threefold SD

99% CI
Δ(16EN-Etio)Δ(16EN-A)Δ(PD-Etio)Δ(PD-A)
Uganda (n = 28)2.82.33.02.3
South Africa (n = 30)2.52.33.22.4
Switzerland (n = 31)3.41.23.21.4
Italy (n = 19)2.92.63.21.8
Argentina (n = 31)2.61.92.71.7
Japan (n = 32)3.22.92.52.3
  • All values are in δ13CVPDB (‰).

  • 16EN, 16(5α)-androstenol; A, androsterone; Etio, etiocholanolone; PD, 5β-pregnanediol.