condition mean min max ZT0-3 33.006077755 32.95261937 33.05953614 ZT4-7 34.61437372499999 34.05323255 35.175514899999996 ZT8-11 39.50982921166667 38.5712386 40.44841982333333 ZT12-15 40.82371825333334 40.760052353333336 40.887384153333336 ZT16-19 43.879120795000006 42.83654773666667 44.92169385333334 ZT20-23 38.81699587333333 34.57368648 43.06030526666667