## tibble [90 × 3] (S3: tbl_df/tbl/data.frame) ## $ year_month: Factor w/ 10 levels "2025-09-01","2025-10-01",..: 1 1 1 1 1 1 2 2 2 2 ... ## $ foot : chr [1:90] "蹄底潰瘍" "白帯病" "趾間フレグモーネ" "上部" ... ## $ value : chr [1:90] "0" "0" "0" "1" ...