condition mean min max ZT0-3 0.5480061666666667 0.4605145 0.6716755 ZT4-7 1.08215 1.08215 1.08215 ZT8-11 0.6107295 0.6107295 0.6107295 ZT12-15 0.474795 0.42448850000000005 0.5251015 ZT16-19 0.2794255 0.2794255 0.2794255 ZT20-23 0.2717185 0.2717185 0.2717185