condition mean min max ZT0-3 4.21921 4.21921 4.21921 ZT4-7 7.1560950000000005 7.1560950000000005 7.1560950000000005 ZT8-11 9.821525000000001 9.821525000000001 9.821525000000001 ZT12-15 10.07738 10.07738 10.07738 ZT16-19 5.04977 5.04977 5.04977 ZT20-23 3.2004200000000003 3.2004200000000003 3.2004200000000003