condition mean min max ZT0-3 0.6323943333333333 0.5926815 0.6742315 ZT4-7 0.9149425 0.9149425 0.9149425 ZT8-11 0.997549 0.997549 0.997549 ZT12-15 1.16261375 0.9963175 1.32891 ZT16-19 1.0698850000000002 1.0698850000000002 1.0698850000000002 ZT20-23 1.2868249999999999 1.2868249999999999 1.2868249999999999