condition mean min max ZT0-3 27.25 27.25 27.25 ZT4-7 5.6 5.6 5.6 ZT8-11 40.15 40.15 40.15 ZT12-15 26.049999999999997 26.049999999999997 26.049999999999997 ZT16-19 23.400000000000002 23.400000000000002 23.400000000000002 ZT20-23 10.6 10.6 10.6