condition mean min max ZT0-3 0.18470034999999999 0.17293355 0.2056635 ZT4-7 0.2996675 0.2996675 0.2996675 ZT8-11 0.2069818 0.2069818 0.2069818 ZT12-15 0.9168722499999999 0.4974845 1.33626 ZT16-19 0.526158 0.526158 0.526158 ZT20-23 0.6270560000000001 0.6270560000000001 0.6270560000000001