condition mean min max ZT0-3 0.8022843333333334 0.7224555 0.9388485 ZT4-7 0.603886 0.603886 0.603886 ZT8-11 1.080283 1.080283 1.080283 ZT12-15 2.0336049999999997 1.9784199999999998 2.08879 ZT16-19 1.896715 1.896715 1.896715 ZT20-23 1.7169699999999999 1.7169699999999999 1.7169699999999999