Figure 2

The risk ratios, of which the mean values are presented by grey dots with the lines showing 95% confidence intervals, of Akha and Lahu tribes compared to Thais for infections with some selected lineages and sublineages of M. tuberculosis. The Y axis is on a logarithmic scale. The vertical lines that intersect the horizontal line 1 indicate statistically non-significant risk-ratios. The risk ratios for L1 were much lower than one while the reverse was true for L2 and L4. The highest risk ratios were observed for L2.2.1.Ancestral 4 and L4.5.2.