condition mean min max ZT0-3 0.42045483333333333 0.1930215 0.734578 ZT4-7 0.6443725 0.6443725 0.6443725 ZT8-11 0.64071 0.64071 0.64071 ZT12-15 0.503045 0.31851850000000004 0.6875715 ZT16-19 0.3649835 0.3649835 0.3649835 ZT20-23 0.22755550000000002 0.22755550000000002 0.22755550000000002