condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.088285 0.0 0.17657 ZT16-19 0.3146985 0.3146985 0.3146985 ZT20-23 0.2572545 0.2572545 0.2572545