condition mean min max ZT0-3 2256.226319 2256.226319 2256.226319 ZT4-7 5829.900068999999 5829.900068999999 5829.900068999999 ZT8-11 7494.142726 7494.142726 7494.142726 ZT12-15 5328.5260905 5328.5260905 5328.5260905 ZT16-19 4037.3189625 4037.3189625 4037.3189625 ZT20-23 2920.075202 2920.075202 2920.075202