condition mean min max ZT0-3 1.6870349999999998 1.6186699999999998 1.7553999999999998 ZT4-7 1.9438549999999999 1.9438549999999999 1.9438549999999999 ZT8-11 2.08568 2.08568 2.08568 ZT12-15 0 0 0 ZT16-19 2.955005 2.955005 2.955005 ZT20-23 2.28424 2.28424 2.28424