condition mean min max ZT0-3 64.863 57.325 72.401 ZT4-7 75.90105 75.90105 75.90105 ZT8-11 74.70425 74.70425 74.70425 ZT12-15 0 0 0 ZT16-19 68.7785 68.7785 68.7785 ZT20-23 77.5036 77.5036 77.5036