condition mean min max ZT0-3 76.03129919 74.8225129 77.24008548 ZT4-7 29.656251375750003 20.5052753515 38.8072274 ZT8-11 14.481787661750001 9.6728057245 19.290769599 ZT12-15 34.2093909475 27.910721700000003 40.508060195 ZT16-19 49.954739520000004 46.978369895 52.93110914500001 ZT20-23 70.45253006000002 67.907393685 72.99766643500001