condition mean min max ZT0-3 3.134045 3.134045 3.134045 ZT4-7 1.932895 1.932895 1.932895 ZT8-11 2.1295450000000002 2.1295450000000002 2.1295450000000002 ZT12-15 1.34788 1.34788 1.34788 ZT16-19 1.62859 1.62859 1.62859 ZT20-23 3.10824 3.10824 3.10824