condition mean min max ZT0-3 57.55 57.55 57.55 ZT4-7 19.0 19.0 19.0 ZT8-11 27.400000000000002 27.400000000000002 27.400000000000002 ZT12-15 62.5 62.5 62.5 ZT16-19 29.7 29.7 29.7 ZT20-23 50.95 50.95 50.95