condition mean min max ZT0-3 19.051299999999998 15.634350000000001 22.468249999999998 ZT4-7 9.370345 9.370345 9.370345 ZT8-11 3.75414 3.75414 3.75414 ZT12-15 0 0 0 ZT16-19 13.711939999999998 13.711939999999998 13.711939999999998 ZT20-23 24.530549999999998 24.530549999999998 24.530549999999998