condition mean min max ZT0-3 0.0325255 0.0 0.065051 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.028263775 0.0 0.05652755 ZT16-19 0.01743765 0.0 0.0348753 ZT20-23 0 0 0