Linear regression model: Table 3 shows linear regression results where a continuous variable for ALT was regressed on log serum PFOA, either cumulative PFOA in 2005/2006 (the C8 Health Study) or measured serum PFOA in 2005/2006, by different categories of obesity in 2005/2006. The gene discussed is GPT; the disease is obesity due to melanocortin 4 receptor deficiency.