condition mean min max ZT0-3 1.2312500000000002 1.2312500000000002 1.2312500000000002 ZT4-7 0.817626 0.817626 0.817626 ZT8-11 1.3430955 1.3430955 1.3430955 ZT12-15 1.0392415000000002 1.0392415000000002 1.0392415000000002 ZT16-19 1.465035 1.465035 1.465035 ZT20-23 1.43358 1.43358 1.43358