condition mean min max ZT0-3 0.031023855500000003 0.0 0.062047711000000005 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.052721548666666666 0.0 0.10544309733333333 ZT20-23 0.0 0.0 0.0