condition mean min max ZT0-3 1383.75 1383.75 1383.75 ZT4-7 1621.6 1621.6 1621.6 ZT8-11 1488.9499999999998 1488.9499999999998 1488.9499999999998 ZT12-15 1606.15 1606.15 1606.15 ZT16-19 1638.35 1638.35 1638.35 ZT20-23 1469.5 1469.5 1469.5