condition mean min max ZT0-3 1.0173246666666667 0.3361425 2.2878249999999998 ZT4-7 2.483925 2.483925 2.483925 ZT8-11 0.0474975 0.0474975 0.0474975 ZT12-15 0.6646479999999999 0.520845 0.8084509999999999 ZT16-19 0.04587625 0.04587625 0.04587625 ZT20-23 0.14966 0.14966 0.14966