condition mean min max ZT0-3 17.1927259775 16.336574195 18.04887776 ZT4-7 14.3698305375 13.460152895 15.27950818 ZT8-11 30.351674662500002 19.348054295 41.35529503 ZT12-15 23.08459504 14.558352565 31.610837515 ZT16-19 12.889007185 12.37992991 13.39808446 ZT20-23 12.3899815575 11.635475265 13.14448785