condition mean min max ZT0-3 2.61654 2.61654 2.61654 ZT4-7 2.7967750000000002 2.7967750000000002 2.7967750000000002 ZT8-11 1.317135 1.317135 1.317135 ZT12-15 0.6770915 0.6770915 0.6770915 ZT16-19 1.6247965 1.6247965 1.6247965 ZT20-23 1.29472 1.29472 1.29472