Plasma concentrations of haptoglobin and hemopexin in relation to in-hospital mortality. (a) Survivors had significantly higher haptoglobin (1,234 μg/dl) than non-survivors (750 μg/dl) (*P = 0.008). (b) Survivors also had significantly higher hemopexin levels (616 μg/dl) than non-survivors (470 μg/dl) (*P = 0.012). Values are medians (middle bold horizontal line) and IQRs (whiskers). Circles and boxes represent individual data points in each group.