condition mean min max ZT0-3 15.827628500000001 1.7812305 37.9855 ZT4-7 9.161850000000001 9.161850000000001 9.161850000000001 ZT8-11 3.9814249999999998 3.9814249999999998 3.9814249999999998 ZT12-15 0.284253 0.13364 0.434866 ZT16-19 0.0 0.0 0.0 ZT20-23 0.897975 0.897975 0.897975