label: Grade 1: mild signs of ischemia (e.g., ABI 0.60-0.79, ankle SBP 70-100 mm Hg, or toe pressure 40-59 mm Hg)
label_lc: grade 1: mild signs of ischemia (e.g., abi 0.60-0.79, ankle sbp 70-100 mm hg, or toe pressure 40-59 mm hg)