condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.035098399999999995 0.035098399999999995 0.035098399999999995 ZT20-23 0.06927593333333333 0.06927593333333333 0.06927593333333333