condition mean min max ZT0-3 570.847441 570.847441 570.847441 ZT4-7 379.2231835 379.2231835 379.2231835 ZT8-11 342.0471195 342.0471195 342.0471195 ZT12-15 345.569321 345.569321 345.569321 ZT16-19 344.863602 344.863602 344.863602 ZT20-23 349.398547 349.398547 349.398547