condition mean min max ZT0-3 7.5918167765 7.178577152999999 8.0050564 ZT4-7 5.907730695250001 5.5160066045 6.299454786 ZT8-11 2.663997687 2.5944963475 2.7334990265 ZT12-15 4.9667343095 4.3639534755 5.5695151435 ZT16-19 9.1901368245 8.5106159905 9.8696576585 ZT20-23 8.42182132125 8.0139753995 8.829667243