condition mean min max ZT0-3 0.15755750000000002 0.15755750000000002 0.15755750000000002 ZT4-7 0.4880875 0.4880875 0.4880875 ZT8-11 0.7628865 0.7628865 0.7628865 ZT12-15 1.7026750000000002 1.7026750000000002 1.7026750000000002 ZT16-19 1.185911 1.185911 1.185911 ZT20-23 0.230869 0.230869 0.230869