condition mean min max ZT0-3 69.0001298025 57.919942000000006 80.080317605 ZT4-7 70.229505895 65.73840414 74.72060765 ZT8-11 69.867918965 66.32299667 73.41284126 ZT12-15 39.1961840075 30.37677273 48.015595285 ZT16-19 29.5137551475 29.419104325 29.60840597 ZT20-23 27.983860362500003 26.283867575000002 29.68385315