condition mean min max ZT0-3 0.004447825 0.004447825 0.004447825 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.01347515 0.01347515 0.01347515 ZT16-19 0.0046916250000000005 0.0046916250000000005 0.0046916250000000005 ZT20-23 0.011557058333333333 0.011557058333333333 0.011557058333333333