condition mean min max ZT0-3 69.8 69.8 69.8 ZT4-7 5.3 5.3 5.3 ZT8-11 24.45 24.45 24.45 ZT12-15 35.400000000000006 35.400000000000006 35.400000000000006 ZT16-19 68.7 68.7 68.7 ZT20-23 88.9 88.9 88.9