condition mean min max ZT0-3 82.270308 82.270308 82.270308 ZT4-7 54.582924500000004 54.582924500000004 54.582924500000004 ZT8-11 45.8895775 45.8895775 45.8895775 ZT12-15 50.2844525 50.2844525 50.2844525 ZT16-19 54.17880649999999 54.17880649999999 54.17880649999999 ZT20-23 51.943231 51.943231 51.943231