condition mean min max ZT0-3 16.0732 16.0732 16.0732 ZT4-7 23.69115 23.69115 23.69115 ZT8-11 12.31635 12.31635 12.31635 ZT12-15 9.8889 9.8889 9.8889 ZT16-19 9.213180000000001 9.213180000000001 9.213180000000001 ZT20-23 15.256 15.256 15.256