condition mean min max ZT0-3 4218.348666 4218.348666 4218.348666 ZT4-7 3349.8071645 3349.8071645 3349.8071645 ZT8-11 2175.2168125 2175.2168125 2175.2168125 ZT12-15 2098.1091635000002 2098.1091635000002 2098.1091635000002 ZT16-19 662.995828 662.995828 662.995828 ZT20-23 538.0320445 538.0320445 538.0320445