condition mean min max ZT0-3 1.1900156666666666 0.7527619999999999 1.753765 ZT4-7 2.0238300000000002 2.0238300000000002 2.0238300000000002 ZT8-11 1.900855 1.900855 1.900855 ZT12-15 1.991997 0.967414 3.0165800000000003 ZT16-19 0.5537165 0.5537165 0.5537165 ZT20-23 0.9164990000000001 0.9164990000000001 0.9164990000000001