condition mean min max ZT0-3 1561.445 1410.0900000000001 1811.455 ZT4-7 1548.13 1548.13 1548.13 ZT8-11 1508.9499999999998 1508.9499999999998 1508.9499999999998 ZT12-15 1574.6174999999998 1496.28 1652.955 ZT16-19 1606.225 1606.225 1606.225 ZT20-23 1359.12 1359.12 1359.12