condition mean min max ZT0-3 1.5866 1.5866 1.5866 ZT4-7 1.2890804999999999 1.2890804999999999 1.2890804999999999 ZT8-11 1.311845 1.311845 1.311845 ZT12-15 0.961014 0.961014 0.961014 ZT16-19 1.54332 1.54332 1.54332 ZT20-23 1.0598575 1.0598575 1.0598575