condition mean min max ZT0-3 1841.65 1841.65 1841.65 ZT4-7 1470.5 1470.5 1470.5 ZT8-11 1284.1999999999998 1284.1999999999998 1284.1999999999998 ZT12-15 1405.8000000000002 1405.8000000000002 1405.8000000000002 ZT16-19 1627.8000000000002 1627.8000000000002 1627.8000000000002 ZT20-23 1822.55 1822.55 1822.55