condition mean min max ZT0-3 0.83623225 0.613893 1.0585715 ZT4-7 0.875238 0.875238 0.875238 ZT8-11 2.0402449999999996 2.0402449999999996 2.0402449999999996 ZT12-15 0 0 0 ZT16-19 1.6101299999999998 1.6101299999999998 1.6101299999999998 ZT20-23 1.66713 1.66713 1.66713