condition mean min max ZT0-3 31.26753333333333 16.147550000000003 40.296499999999995 ZT4-7 22.078200000000002 22.078200000000002 22.078200000000002 ZT8-11 27.7267 27.7267 27.7267 ZT12-15 24.40515 23.31275 25.497549999999997 ZT16-19 33.2571 33.2571 33.2571 ZT20-23 47.4167 47.4167 47.4167