condition mean min max ZT0-3 38.20675 33.6498 42.7637 ZT4-7 22.92135 22.92135 22.92135 ZT8-11 20.9768 20.9768 20.9768 ZT12-15 0 0 0 ZT16-19 29.73695 29.73695 29.73695 ZT20-23 27.944650000000003 27.944650000000003 27.944650000000003