condition mean min max ZT0-3 50.04262 50.04262 50.04262 ZT4-7 68.06739 68.06739 68.06739 ZT8-11 81.33921 81.33921 81.33921 ZT12-15 49.37314 49.37314 49.37314 ZT16-19 73.07925 73.07925 73.07925 ZT20-23 78.05193666666668 78.05193666666668 78.05193666666668