condition mean min max ZT0-3 12.007598 12.007598 12.007598 ZT4-7 10.479246 10.479246 10.479246 ZT8-11 10.5807515 10.5807515 10.5807515 ZT12-15 11.210526 11.210526 11.210526 ZT16-19 10.39866 10.39866 10.39866 ZT20-23 12.1803745 12.1803745 12.1803745