condition mean min max ZT0-3 8.5020266355 6.096146 10.907907271 ZT4-7 14.096176244999999 13.886688679999999 14.30566381 ZT8-11 19.212144795 15.561266954999999 22.863022635 ZT12-15 39.778615402499995 39.631683105 39.925547699999996 ZT16-19 33.5820788675 29.05709702 38.107060715 ZT20-23 19.5801268775 19.348094915 19.812158840000002