LEP and idiopathic pulmonary fibrosis: There was no difference (p = 0.71) in plasma leptin between decedents (n = 26, 22.41 ± 12.29 ng/mL) and survivors (n = 3, 20.08 ± 13.51 ng/mL) in the subgroup of subjects with AE-IPF, nor did plasma leptin discriminate between decedents (n = 7) and survivors (n = 21) in the S-IPF subgroup (13.57 ± 7.16 versus 10.86 ± 8.43 ng/mL, p = 0.203).