condition mean min max ZT0-3 18.06735 14.3381 25.29235 ZT4-7 21.94865 21.94865 21.94865 ZT8-11 23.92875 23.92875 23.92875 ZT12-15 21.829974999999997 18.24645 25.4135 ZT16-19 12.87555 12.87555 12.87555 ZT20-23 14.228950000000001 14.228950000000001 14.228950000000001