condition mean min max ZT0-3 27.541425 24.53815 30.5447 ZT4-7 28.18475 28.18475 28.18475 ZT8-11 83.14259999999999 83.14259999999999 83.14259999999999 ZT12-15 0 0 0 ZT16-19 77.71065 77.71065 77.71065 ZT20-23 50.707300000000004 50.707300000000004 50.707300000000004