condition mean min max ZT0-3 0.7485735 0.478464 1.018683 ZT4-7 1.114214 1.114214 1.114214 ZT8-11 0.400391 0.400391 0.400391 ZT12-15 0 0 0 ZT16-19 1.087835 1.087835 1.087835 ZT20-23 0.48092650000000003 0.48092650000000003 0.48092650000000003