We demonstrate that the second-order perturbative approximation leads to erroneous or even physically impossible estimates of mean reactive-constituent concentrations when the variance of the mixing ratio is high and the relationship between the mixing ratio and the reactive-constituent concentrations strongly deviates from a quadratic function.
A significant decrease in the mean apremilast concentration was noted after administration for 2 weeks of twice daily oral rifampicin, to the extent that there was a clear separation in the mean plasma concentration when apremilast was administered alone vs. when it was co-administered with oral rifampicin for 2 weeks.
Between-batch CVs based on the QC samples were generally low (< 15%) except when mean concentrations were near the limit of detection (LOD) (see Supplemental Material, Table S1).
The mean lumefantrine day 7 concentrations when combined with efavirenz are below 280 ng ml−1, but close to 175 ng ml−1.
In the present study, the use of the geometric mean of repeated urinary paraben concentrations, when available, generally resulted in weaker associations with reproductive measures.
These data represent a broad range of sampling regimens (e.g., spot and composite samples) and different types of measurements (e.g., peak vs. mean concentrations), so care is needed when interpreting the results.
The most prominent non- ortho-DL-PCB congener in reindeer milk (Table 2) was PCB-126; this concerns both summer and autumn samples, when the mean concentrations were 5 and 2.7 pg/g fat, respectively.
There was also a highly significant difference when comparing the mean concentrations of PGE2 between the two drug groups at 24 h (p = 0.006) and 48 h (p = 0.011).
When 3-day mean concentrations of air pollutants were explanatory variables, adjusted variables were also included as 3-day mean values.
When the pFID method was used, the calculated concentrations for individual subjects and the mean concentrations for all subjects were independent of coil loading conditions and agreed with the nominal concentrations.
