condition mean min max ZT0-3 0.16076233333333334 0.0827175 0.22514199999999998 ZT4-7 0.4815915 0.4815915 0.4815915 ZT8-11 0.44358749999999997 0.44358749999999997 0.44358749999999997 ZT12-15 0.14750945000000001 0.0877774 0.20724150000000002 ZT16-19 0.23720999999999998 0.23720999999999998 0.23720999999999998 ZT20-23 0.1812555 0.1812555 0.1812555