condition mean min max ZT0-3 0.06538565 0.0348913 0.09588 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.03309157916666667 0.030165333333333332 0.036017825 ZT16-19 0.0 0.0 0.0 ZT20-23 0 0 0