condition mean min max ZT0-3 0.90592675 0.8710125 0.940841 ZT4-7 0.9502055 0.9502055 0.9502055 ZT8-11 0.832889 0.832889 0.832889 ZT12-15 0 0 0 ZT16-19 2.3388 2.3388 2.3388 ZT20-23 1.63125 1.63125 1.63125