condition mean min max ZT0-3 21.0979 20.01625 22.17955 ZT4-7 18.477800000000002 18.477800000000002 18.477800000000002 ZT8-11 14.1019 14.1019 14.1019 ZT12-15 0 0 0 ZT16-19 28.591 28.591 28.591 ZT20-23 16.545299999999997 16.545299999999997 16.545299999999997