control: n = 12, below the LOD = 3, log-SD of detected values = 1.067
treated: n = 12, below the LOD = 0, log-SD of detected values = 0.590
LOD/2 substitution, Welch's t-test on log values: ratio of geometric means 2.05, log-SD control 1.145, p = 0.0704
Mann-Whitney test (values below the LOD tied at the bottom): p = 0.0119
Left-censored log-normal model (maximum likelihood): ratio of geometric means 1.97 (95% CI 0.98 to 3.98), log-SD 0.860, p = 0.0579