condition mean min max ZT0-3 24.518549999999998 24.518549999999998 24.518549999999998 ZT4-7 21.7427 21.7427 21.7427 ZT8-11 17.774700000000003 17.774700000000003 17.774700000000003 ZT12-15 19.3904 19.3904 19.3904 ZT16-19 17.07985 17.07985 17.07985 ZT20-23 19.0073 19.0073 19.0073