Figure 1From: QuantiFERON-TB Gold In-Tube test conversions and reversions among tuberculosis patients and their household contacts in Addis Ababa: a one year follow-up study Comparison of median levels of IFN-γ at baseline and 12 months later among patients (n = 32) and contacts (n = 74). Wilcoxon matched-pairs signed rank test was used to analyze the data. Each filled circle represents a participant and the horizontal solid lines represent medians. The median level of IFN-γ among contacts was significantly increased at 12 months compared to baseline level but among patients, there was no significant difference.Back to article page