condition mean min max ZT0-3 0.42961000000000005 0.42961000000000005 0.42961000000000005 ZT4-7 0.26714400000000005 0.26714400000000005 0.26714400000000005 ZT8-11 0.2347055 0.2347055 0.2347055 ZT12-15 0.440286 0.440286 0.440286 ZT16-19 0.809906 0.809906 0.809906 ZT20-23 0.426817 0.426817 0.426817