condition mean min max ZT0-3 57.650000000000006 57.650000000000006 57.650000000000006 ZT4-7 56.7 56.7 56.7 ZT8-11 41.4 41.4 41.4 ZT12-15 52.0 52.0 52.0 ZT16-19 41.7 41.7 41.7 ZT20-23 33.55 33.55 33.55