condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.011665555 0.0 0.02333111 ZT8-11 0.004306698 0.0 0.008613396 ZT12-15 0.0059010655 0.0 0.011802131 ZT16-19 0.0 0.0 0.0 ZT20-23 0.019226775 0.008026616 0.030426934