condition mean min max ZT0-3 0.8134301666666667 0.60283 1.0572405 ZT4-7 0.51895 0.51895 0.51895 ZT8-11 1.4739900000000001 1.4739900000000001 1.4739900000000001 ZT12-15 2.70618 1.7809400000000002 3.63142 ZT16-19 2.3125299999999998 2.3125299999999998 2.3125299999999998 ZT20-23 1.42146 1.42146 1.42146