condition mean min max ZT0-3 22.0024 22.0024 22.0024 ZT4-7 19.741999999999997 19.741999999999997 19.741999999999997 ZT8-11 22.090400000000002 22.090400000000002 22.090400000000002 ZT12-15 21.787300000000002 21.787300000000002 21.787300000000002 ZT16-19 26.8139 26.8139 26.8139 ZT20-23 25.461199999999998 25.461199999999998 25.461199999999998