condition mean min max ZT0-3 1473.3000000000002 1473.3000000000002 1473.3000000000002 ZT4-7 1497.0 1497.0 1497.0 ZT8-11 1503.8000000000002 1503.8000000000002 1503.8000000000002 ZT12-15 1486.45 1486.45 1486.45 ZT16-19 1499.0 1499.0 1499.0 ZT20-23 1384.65 1384.65 1384.65