condition mean min max ZT0-3 11.19815 10.7922 11.6041 ZT4-7 2.3064150000000003 2.3064150000000003 2.3064150000000003 ZT8-11 2.5297549999999998 2.5297549999999998 2.5297549999999998 ZT12-15 0 0 0 ZT16-19 9.25404 9.25404 9.25404 ZT20-23 6.62599 6.62599 6.62599