condition mean min max ZT0-3 22.308149812499998 13.5460207 31.070278924999997 ZT4-7 36.4442613825 35.76019246 37.128330305000006 ZT8-11 20.987266355 16.94718807 25.02734464 ZT12-15 8.31814200425 6.257418234999999 10.3788657735 ZT16-19 21.538589019999996 18.080867514999998 24.996310525 ZT20-23 27.389513455 27.3871615 27.39186541