condition mean min max ZT0-3 56.311955145 46.35630626 66.26760403 ZT4-7 9.266461070750001 8.0534208005 10.479501341 ZT8-11 10.24033202175 7.680066628999999 12.8005974145 ZT12-15 9.39523344425 7.928350421500001 10.862116467 ZT16-19 10.6337401365 10.001136133 11.266344140000001 ZT20-23 16.40069288 16.39953373 16.40185203