condition mean min max ZT0-3 0.244645 0.0 0.733935 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.1842825 0.0 0.368565 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0 0.0 0.0