condition mean min max ZT0-3 76.06395209749999 65.090154655 87.03774954 ZT4-7 14.103309299 10.269983109 17.936635489 ZT8-11 20.07998173 16.147693495 24.012269965 ZT12-15 51.4311285725 41.760131189999996 61.102125955 ZT16-19 52.032254525 49.762194855000004 54.302314195 ZT20-23 41.880706145 38.49714167 45.26427062