condition mean min max ZT0-3 1.9619575 1.6346500000000002 2.289265 ZT4-7 1.9935649999999998 1.9935649999999998 1.9935649999999998 ZT8-11 2.36133 2.36133 2.36133 ZT12-15 0 0 0 ZT16-19 5.3225549999999995 5.3225549999999995 5.3225549999999995 ZT20-23 3.519235 3.519235 3.519235