condition mean min max ZT0-3 23.506999999999998 23.506999999999998 23.506999999999998 ZT4-7 7.93448 7.93448 7.93448 ZT8-11 12.5539 12.5539 12.5539 ZT12-15 22.287950000000002 22.287950000000002 22.287950000000002 ZT16-19 35.63755 35.63755 35.63755 ZT20-23 31.86285 31.86285 31.86285