condition mean min max ZT0-3 1.8053075 1.5533000000000001 2.057315 ZT4-7 3.098765 3.098765 3.098765 ZT8-11 2.32247 2.32247 2.32247 ZT12-15 0 0 0 ZT16-19 3.087325 3.087325 3.087325 ZT20-23 2.9716899999999997 2.9716899999999997 2.9716899999999997