condition mean min max ZT0-3 48.741081035 40.39976186 57.08240021 ZT4-7 25.2724297775 24.703307625 25.84155193 ZT8-11 26.9074148625 24.103265365 29.711564360000004 ZT12-15 29.68707122 28.927813909999998 30.446328530000002 ZT16-19 51.2103317475 44.67766324 57.743000255 ZT20-23 79.62927518000001 69.29681213500001 89.961738225