condition mean min max ZT0-3 1.6864599999999998 1.6864599999999998 1.6864599999999998 ZT4-7 4.40125 4.40125 4.40125 ZT8-11 1.914415 1.914415 1.914415 ZT12-15 1.3064195 1.3064195 1.3064195 ZT16-19 2.20492 2.20492 2.20492 ZT20-23 2.01007 2.01007 2.01007