condition mean min max ZT0-3 58.9 58.9 58.9 ZT4-7 35.7 35.7 35.7 ZT8-11 47.650000000000006 47.650000000000006 47.650000000000006 ZT12-15 41.35 41.35 41.35 ZT16-19 12.95 12.95 12.95 ZT20-23 18.700000000000003 18.700000000000003 18.700000000000003