condition mean min max ZT0-3 25.486649999999997 11.6833 34.2354 ZT4-7 9.301545 9.301545 9.301545 ZT8-11 10.385485 10.385485 10.385485 ZT12-15 21.5139 20.450400000000002 22.5774 ZT16-19 27.01515 27.01515 27.01515 ZT20-23 37.58365 37.58365 37.58365