condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 6.81195 6.81195 6.81195 ZT8-11 0.0 0.0 0.0 ZT12-15 4.52873 4.52873 4.52873 ZT16-19 4.01555 4.01555 4.01555 ZT20-23 4.92414 4.92414 4.92414