condition mean min max ZT0-3 17.0254 17.0254 17.0254 ZT4-7 16.1492 16.1492 16.1492 ZT8-11 28.26015 28.26015 28.26015 ZT12-15 26.78085 26.78085 26.78085 ZT16-19 21.5424 21.5424 21.5424 ZT20-23 17.2857 17.2857 17.2857