condition mean min max ZT0-3 0.25376375 0.201443 0.3060845 ZT4-7 0.7171925 0.7171925 0.7171925 ZT8-11 0.409356 0.409356 0.409356 ZT12-15 0 0 0 ZT16-19 0.4005805 0.4005805 0.4005805 ZT20-23 0.2025435 0.2025435 0.2025435