condition mean min max ZT0-3 1.005399 1.005399 1.005399 ZT4-7 0.691085 0.691085 0.691085 ZT8-11 0.9114644999999999 0.9114644999999999 0.9114644999999999 ZT12-15 0.750108 0.750108 0.750108 ZT16-19 1.0342415 1.0342415 1.0342415 ZT20-23 0.598024 0.598024 0.598024