condition mean min max ZT0-3 27.4 27.4 27.4 ZT4-7 45.6 45.6 45.6 ZT8-11 21.799999999999997 21.799999999999997 21.799999999999997 ZT12-15 36.15 36.15 36.15 ZT16-19 47.400000000000006 47.400000000000006 47.400000000000006 ZT20-23 33.05 33.05 33.05