condition mean min max ZT0-3 30.950000000000003 30.950000000000003 30.950000000000003 ZT4-7 57.6 57.6 57.6 ZT8-11 32.0 32.0 32.0 ZT12-15 44.05 44.05 44.05 ZT16-19 61.650000000000006 61.650000000000006 61.650000000000006 ZT20-23 63.55 63.55 63.55