condition mean min max ZT0-3 1492.3000000000002 1492.3000000000002 1492.3000000000002 ZT4-7 1794.4 1794.4 1794.4 ZT8-11 1557.15 1557.15 1557.15 ZT12-15 1482.5 1482.5 1482.5 ZT16-19 1645.6999999999998 1645.6999999999998 1645.6999999999998 ZT20-23 1549.9 1549.9 1549.9