condition mean min max ZT0-3 33.35995 33.35995 33.35995 ZT4-7 33.563199999999995 33.563199999999995 33.563199999999995 ZT8-11 32.42085 32.42085 32.42085 ZT12-15 35.682050000000004 35.682050000000004 35.682050000000004 ZT16-19 46.862449999999995 46.862449999999995 46.862449999999995 ZT20-23 37.544349999999994 37.544349999999994 37.544349999999994