condition mean min max ZT0-3 77.3651 77.3651 77.3651 ZT4-7 68.5189 68.5189 68.5189 ZT8-11 62.069500000000005 62.069500000000005 62.069500000000005 ZT12-15 69.88835 69.88835 69.88835 ZT16-19 73.4556 73.4556 73.4556 ZT20-23 86.97983333333333 86.97983333333333 86.97983333333333