condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0199618155 0.0 0.039923631 ZT12-15 0.007653266666666666 0.0 0.015306533333333332 ZT16-19 0.0074762890000000005 0.0 0.014952578000000001 ZT20-23 0.0108263915 0.0 0.021652783