condition mean min max ZT0-3 6.451178333333333 4.362805 9.409905 ZT4-7 10.896725 10.896725 10.896725 ZT8-11 10.126375 10.126375 10.126375 ZT12-15 27.756025 24.30925 31.2028 ZT16-19 16.4804 16.4804 16.4804 ZT20-23 12.386849999999999 12.386849999999999 12.386849999999999