condition mean min max ZT0-3 0.04334275 0.0 0.0866855 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0 0 0 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0852225 0.0852225 0.0852225