condition mean min max ZT0-3 40.561616666666666 37.161500000000004 45.42745 ZT4-7 35.24675 35.24675 35.24675 ZT8-11 34.68555 34.68555 34.68555 ZT12-15 45.922349999999994 45.816649999999996 46.02805 ZT16-19 33.510400000000004 33.510400000000004 33.510400000000004 ZT20-23 41.32475 41.32475 41.32475