condition mean min max ZT0-3 65.3 65.3 65.3 ZT4-7 12.7 12.7 12.7 ZT8-11 27.599999999999998 27.599999999999998 27.599999999999998 ZT12-15 53.650000000000006 53.650000000000006 53.650000000000006 ZT16-19 45.5 45.5 45.5 ZT20-23 84.95 84.95 84.95