condition mean min max ZT0-3 0.013330775 0.0 0.02666155 ZT4-7 0.0 0.0 0.0 ZT8-11 0.05478265 0.05478265 0.05478265 ZT12-15 0 0 0 ZT16-19 0.02691005 0.02691005 0.02691005 ZT20-23 0.02710565 0.02710565 0.02710565