condition mean min max ZT0-3 1.974625 1.974625 1.974625 ZT4-7 1.48663 1.48663 1.48663 ZT8-11 1.883315 1.883315 1.883315 ZT12-15 3.37099 3.37099 3.37099 ZT16-19 3.0697 3.0697 3.0697 ZT20-23 2.6260000000000003 2.6260000000000003 2.6260000000000003