condition mean min max ZT0-3 11.831524 11.831524 11.831524 ZT4-7 11.850257 11.850257 11.850257 ZT8-11 11.2586075 11.2586075 11.2586075 ZT12-15 11.533945 11.533945 11.533945 ZT16-19 10.982668499999999 10.982668499999999 10.982668499999999 ZT20-23 10.7063015 10.7063015 10.7063015