condition mean min max ZT0-3 55.299400000000006 53.7357 56.8631 ZT4-7 50.35865 50.35865 50.35865 ZT8-11 19.59695 19.59695 19.59695 ZT12-15 0 0 0 ZT16-19 27.02995 27.02995 27.02995 ZT20-23 34.98295 34.98295 34.98295