condition mean min max ZT0-3 0.297592 0.297592 0.297592 ZT4-7 0.268849 0.268849 0.268849 ZT8-11 0.07912564999999999 0.07912564999999999 0.07912564999999999 ZT12-15 0.3234765 0.3234765 0.3234765 ZT16-19 1.2772 1.2772 1.2772 ZT20-23 1.1219396666666668 1.1219396666666668 1.1219396666666668