condition mean min max ZT0-3 50.75 50.75 50.75 ZT4-7 13.9 13.9 13.9 ZT8-11 41.05 41.05 41.05 ZT12-15 50.650000000000006 50.650000000000006 50.650000000000006 ZT16-19 74.0 74.0 74.0 ZT20-23 79.19999999999999 79.19999999999999 79.19999999999999