condition mean min max ZT0-3 12.91005 12.91005 12.91005 ZT4-7 11.54425 11.54425 11.54425 ZT8-11 7.553445 7.553445 7.553445 ZT12-15 9.4296 9.4296 9.4296 ZT16-19 14.63825 14.63825 14.63825 ZT20-23 14.69005 14.69005 14.69005