condition mean min max ZT0-3 880.337911 880.337911 880.337911 ZT4-7 2139.6187535 2139.6187535 2139.6187535 ZT8-11 2356.2249415 2356.2249415 2356.2249415 ZT12-15 1496.0962175 1496.0962175 1496.0962175 ZT16-19 672.712991 672.712991 672.712991 ZT20-23 480.4552555 480.4552555 480.4552555