condition mean min max ZT0-3 1488.2 1488.2 1488.2 ZT4-7 1544.8 1544.8 1544.8 ZT8-11 1555.0500000000002 1555.0500000000002 1555.0500000000002 ZT12-15 1516.8 1516.8 1516.8 ZT16-19 1402.85 1402.85 1402.85 ZT20-23 1366.35 1366.35 1366.35