Table 4 Characteristics of ABCG2 variant allele carriers and wild type (wt) homozygotes before (full dataset) and after matching. Data are counts (%), mean±SD or geometric mean (geometric coefficient of variation, %) for pharmacokinetic variables. Differences are expressed as standardized mean difference (d). For pharmacokinetic parameters, d was calculated based on mean (SD) of ln-transformed data. Values <0.1 indicate irrelevant differences. Variables included in the matching procedure are shaded.