condition mean min max ZT0-3 0.6794266666666667 0.49594099999999997 0.835188 ZT4-7 1.031998 1.031998 1.031998 ZT8-11 1.28838 1.28838 1.28838 ZT12-15 2.55455 2.227615 2.8814849999999996 ZT16-19 2.179175 2.179175 2.179175 ZT20-23 1.6029200000000001 1.6029200000000001 1.6029200000000001