condition mean min max ZT0-3 167.177846 167.177846 167.177846 ZT4-7 135.498055 135.498055 135.498055 ZT8-11 164.3736125 164.3736125 164.3736125 ZT12-15 182.1817945 182.1817945 182.1817945 ZT16-19 256.332745 256.332745 256.332745 ZT20-23 275.15729250000004 275.15729250000004 275.15729250000004