label: Grade 2: moderate signs of ischemia (e.g., ABI 0.40-0.59, ankle SBP 50-70 mm Hg, or toe pressure 30-39 mm Hg)
label_lc: grade 2: moderate signs of ischemia (e.g., abi 0.40-0.59, ankle sbp 50-70 mm hg, or toe pressure 30-39 mm hg)