condition mean min max ZT0-3 1.6224405 1.456795 1.7494815 ZT4-7 1.86645 1.86645 1.86645 ZT8-11 2.7151050000000003 2.7151050000000003 2.7151050000000003 ZT12-15 3.2980549999999997 2.34667 4.24944 ZT16-19 6.1443 6.1443 6.1443 ZT20-23 3.82354 3.82354 3.82354