condition mean min max ZT0-3 41.6 41.6 41.6 ZT4-7 33.3 33.3 33.3 ZT8-11 54.35 54.35 54.35 ZT12-15 56.050000000000004 56.050000000000004 56.050000000000004 ZT16-19 63.650000000000006 63.650000000000006 63.650000000000006 ZT20-23 49.25 49.25 49.25