condition mean min max ZT0-3 28.400000000000002 28.400000000000002 28.400000000000002 ZT4-7 27.6 27.6 27.6 ZT8-11 55.65 55.65 55.65 ZT12-15 21.2 21.2 21.2 ZT16-19 15.85 15.85 15.85 ZT20-23 49.95 49.95 49.95