condition mean min max ZT0-3 0.7245325 0.7245325 0.7245325 ZT4-7 0.6595455 0.6595455 0.6595455 ZT8-11 0.924248 0.924248 0.924248 ZT12-15 0.9214585 0.9214585 0.9214585 ZT16-19 1.051777 1.051777 1.051777 ZT20-23 0.5825955 0.5825955 0.5825955