condition mean min max ZT0-3 0.03912855 0.0 0.088954 ZT4-7 0.232996 0.232996 0.232996 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.114228 0.114228 0.114228 ZT20-23 0.0 0.0 0.0