condition mean min max ZT0-3 7.839992499999999 7.4628950000000005 8.217089999999999 ZT4-7 0.9387475000000001 0.9387475000000001 0.9387475000000001 ZT8-11 0.8312425 0.8312425 0.8312425 ZT12-15 0 0 0 ZT16-19 2.0351635 2.0351635 2.0351635 ZT20-23 2.0529945 2.0529945 2.0529945