condition mean min max ZT0-3 0.500838 0.369369 0.6430775 ZT4-7 0.2337375 0.2337375 0.2337375 ZT8-11 0.24287799999999998 0.24287799999999998 0.24287799999999998 ZT12-15 0.43914175 0.310183 0.5681005 ZT16-19 0.530912 0.530912 0.530912 ZT20-23 0.6995085000000001 0.6995085000000001 0.6995085000000001