condition mean min max ZT0-3 46.613575 36.3702 56.85695 ZT4-7 29.466700000000003 29.466700000000003 29.466700000000003 ZT8-11 41.86735 41.86735 41.86735 ZT12-15 0 0 0 ZT16-19 40.05255 40.05255 40.05255 ZT20-23 41.81145 41.81145 41.81145