condition mean min max ZT0-3 0.87993375 0.6824975 1.07737 ZT4-7 10.218125 10.218125 10.218125 ZT8-11 20.4032 20.4032 20.4032 ZT12-15 0 0 0 ZT16-19 7.961525 7.961525 7.961525 ZT20-23 1.304405 1.304405 1.304405