condition mean min max ZT0-3 0.6462823333333333 0.5112304999999999 0.8466274999999999 ZT4-7 0.121395 0.121395 0.121395 ZT8-11 0.829877 0.829877 0.829877 ZT12-15 0.7683025 0.3279395 1.2086655 ZT16-19 1.150275 1.150275 1.150275 ZT20-23 1.424315 1.424315 1.424315