condition mean min max ZT0-3 5.2113875 4.989375 5.4334 ZT4-7 6.86742 6.86742 6.86742 ZT8-11 5.39982 5.39982 5.39982 ZT12-15 0 0 0 ZT16-19 5.961665 5.961665 5.961665 ZT20-23 6.856669999999999 6.856669999999999 6.856669999999999