Fig. 2
From: Benchmark dose calculations for PFAS exposure based on two data sets on immunotoxic effects
Profile likelihood function for the break-point in the hockey stick model. In the German study [11] (top graph), tetanus and diphtheria concentrations indicates a break-point around 37 ng/mL, while the HiB concentration and the Faroese data [15] (lower graph) show no signs of a break-point. The Faroese curves are both non-concave and for diphtheria the best fitting model is a linear curve with no break-point