RETN and pulmonary arterial hypertension: We arranged resistin levels in PAH patients (n = 1064) by quartiles: group 1 (< 25th percentile, n = 255; median log(resistin) = 0.609); group 2 (25th to 50th percentile, n = 233; median log(resistin) = 0.761); group 3 (50th to 75th percentile, n = 266; log(resistin) = 0.885); and group 4 (> 75th percentile, n = 241; median log(resistin) = 1.14).