condition mean min max ZT0-3 3.0677320552500005 1.762699934 4.3727641765000005 ZT4-7 3.45002507125 3.3603428629999996 3.5397072795 ZT8-11 12.16785438325 4.025879392 20.3098293745 ZT12-15 56.455126515 40.551321295 72.358931735 ZT16-19 52.293042064999995 51.79049371 52.795590419999996 ZT20-23 41.58540463 35.04857755 48.12223171