condition mean min max ZT0-3 1.7219449999999998 1.7219449999999998 1.7219449999999998 ZT4-7 5.554415 5.554415 5.554415 ZT8-11 2.5226100000000002 2.5226100000000002 2.5226100000000002 ZT12-15 1.84609 1.84609 1.84609 ZT16-19 0.8239715000000001 0.8239715000000001 0.8239715000000001 ZT20-23 1.182115 1.182115 1.182115