condition mean min max ZT0-3 5.3966650000000005 5.3966650000000005 5.3966650000000005 ZT4-7 6.847135 6.847135 6.847135 ZT8-11 16.6724 16.6724 16.6724 ZT12-15 34.3226 34.3226 34.3226 ZT16-19 7.2887 7.2887 7.2887 ZT20-23 7.290380000000001 7.290380000000001 7.290380000000001