condition mean min max ZT0-3 4.71147 4.71147 4.71147 ZT4-7 3.68738 3.68738 3.68738 ZT8-11 4.191675 4.191675 4.191675 ZT12-15 3.948715 3.948715 3.948715 ZT16-19 5.08906 5.08906 5.08906 ZT20-23 4.0859950000000005 4.0859950000000005 4.0859950000000005