condition mean min max ZT0-3 0.950485 0.9433445 0.9576255 ZT4-7 0.793995 0.793995 0.793995 ZT8-11 0.7979345 0.7979345 0.7979345 ZT12-15 0 0 0 ZT16-19 0.313843 0.313843 0.313843 ZT20-23 0.7892215 0.7892215 0.7892215