condition mean min max ZT0-3 10.217422 10.217422 10.217422 ZT4-7 9.5660635 9.5660635 9.5660635 ZT8-11 8.7788905 8.7788905 8.7788905 ZT12-15 9.0314865 9.0314865 9.0314865 ZT16-19 10.746935 10.746935 10.746935 ZT20-23 8.811311 8.811311 8.811311