Mean ALT Levels Across Time by Treatment Group for All Participants
Means estimated by fitting a linear mixed model with alanine aminotransferase (ALT) as outcome and treatment group and time point (treated as categorical) and their interaction as covariates. Dotted line at y=45 U/L indicates the ALT value considered the upper limit of normal for this study. Time axis has been shifted slightly to the right by 0.3 units for 420-mg silymarin and 0.6 units for 700-mg silymarin to separate the error bars. Error bars indicate 95% CIs.