condition mean min max ZT0-3 0.0163671 0.0 0.0491013 ZT4-7 0.0 0.0 0.0 ZT8-11 1.9213475 1.9213475 1.9213475 ZT12-15 4.7023475 3.363125 6.04157 ZT16-19 2.16473 2.16473 2.16473 ZT20-23 0.7081175 0.7081175 0.7081175