condition mean min max ZT0-3 80.98571866083333 60.851368955 101.12006836666667 ZT4-7 127.49527769999999 117.79639879999999 137.19415659999999 ZT8-11 141.25087185 127.43781790000001 155.0639258 ZT12-15 70.13919925166667 60.61675696 79.66164154333333 ZT16-19 49.224416595 46.572546020000004 51.87628717 ZT20-23 33.822262805 29.39841068 38.246114930000005