condition mean min max ZT0-3 0.03069466 0.03069466 0.03069466 ZT4-7 0.04818685 0.04818685 0.04818685 ZT8-11 0.0107676 0.0107676 0.0107676 ZT12-15 0.012082470000000001 0.012082470000000001 0.012082470000000001 ZT16-19 0.009916766666666667 0.009916766666666667 0.009916766666666667 ZT20-23 0.008171099999999999 0.008171099999999999 0.008171099999999999