preferred_name: Grade 0: no signs of ischemia (e.g., ABI>0.80, ankle SBP >100 mm Hg, or toe pressure >=60 mm Hg)
preferred_name_lc: grade 0: no signs of ischemia (e.g., abi>0.80, ankle sbp >100 mm hg, or toe pressure >=60 mm hg)
label: Grade 0: no signs of ischemia (e.g., ABI>0.80, ankle SBP >100 mm Hg, or toe pressure >=60 mm Hg)
label_lc: grade 0: no signs of ischemia (e.g., abi>0.80, ankle sbp >100 mm hg, or toe pressure >=60 mm hg)