condition mean min max ZT0-3 33.25 33.25 33.25 ZT4-7 30.2 30.2 30.2 ZT8-11 25.2 25.2 25.2 ZT12-15 18.95 18.95 18.95 ZT16-19 37.550000000000004 37.550000000000004 37.550000000000004 ZT20-23 42.650000000000006 42.650000000000006 42.650000000000006