condition mean min max ZT0-3 65.52587764 44.95834722 86.09340806 ZT4-7 23.752429579999998 22.552285455 24.952573705 ZT8-11 15.7505721275 15.220627255 16.280517 ZT12-15 8.9840778035 8.0477597965 9.9203958105 ZT16-19 15.957581105000001 12.164189945 19.750972265 ZT20-23 37.982237597499996 30.41137941 45.553095785