condition mean min max ZT0-3 1352.8 1352.8 1352.8 ZT4-7 1870.9 1870.9 1870.9 ZT8-11 1971.85 1971.85 1971.85 ZT12-15 1492.4499999999998 1492.4499999999998 1492.4499999999998 ZT16-19 1353.25 1353.25 1353.25 ZT20-23 1457.85 1457.85 1457.85