condition mean min max ZT0-3 11.755826 11.755826 11.755826 ZT4-7 10.704421499999999 10.704421499999999 10.704421499999999 ZT8-11 10.605220500000001 10.605220500000001 10.605220500000001 ZT12-15 10.324306499999999 10.324306499999999 10.324306499999999 ZT16-19 12.787832 12.787832 12.787832 ZT20-23 13.1714785 13.1714785 13.1714785