## tibble [126 × 3] (S3: tbl_df/tbl/data.frame)
## $ year_month: Factor w/ 10 levels "2025-04-01","2025-05-01",..: 1 1 1 1 1 1 2 2 2 2 ...
## $ foot : chr [1:126] "趾間皮膚炎" "蹄底潰瘍" "白帯病" "趾間フレグモーネ" ...
## $ value : chr [1:126] "0" "1" "1" "0" ...