condition mean min max ZT0-3 0.6578293333333333 0.054513 1.249275 ZT4-7 0.888085 0.888085 0.888085 ZT8-11 0.461175 0.461175 0.461175 ZT12-15 2.7650255762500002 2.3099911525 3.22006 ZT16-19 2.00648 2.00648 2.00648 ZT20-23 0.626335 0.626335 0.626335