condition mean min max ZT0-3 0.221514625 0.08791175 0.3551175 ZT4-7 0.206922 0.206922 0.206922 ZT8-11 0.17714850000000001 0.17714850000000001 0.17714850000000001 ZT12-15 0 0 0 ZT16-19 0.32001500000000005 0.32001500000000005 0.32001500000000005 ZT20-23 0.14604499999999998 0.14604499999999998 0.14604499999999998