condition mean min max ZT0-3 11.533945 11.533945 11.533945 ZT4-7 11.969563 11.969563 11.969563 ZT8-11 13.742215 13.742215 13.742215 ZT12-15 14.287854500000002 14.287854500000002 14.287854500000002 ZT16-19 10.548416 10.548416 10.548416 ZT20-23 17.162557 17.162557 17.162557