condition mean min max ZT0-3 5.590675 5.355585 5.8257650000000005 ZT4-7 4.277305 4.277305 4.277305 ZT8-11 3.6752700000000003 3.6752700000000003 3.6752700000000003 ZT12-15 0 0 0 ZT16-19 5.966985 5.966985 5.966985 ZT20-23 4.82108 4.82108 4.82108