condition mean min max ZT0-3 1609.8000000000002 1609.8000000000002 1609.8000000000002 ZT4-7 1447.2 1447.2 1447.2 ZT8-11 1458.9499999999998 1458.9499999999998 1458.9499999999998 ZT12-15 1576.1999999999998 1576.1999999999998 1576.1999999999998 ZT16-19 1486.0500000000002 1486.0500000000002 1486.0500000000002 ZT20-23 1520.85 1520.85 1520.85