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Distribution of QFT positivity among ever-smokers and never-smokers by smoking status, gender (1A) and age (1B). After classified by gender and age groups, ever-smokers were still more likely to be QFT positivity than never-smokers (*: p < 0.05, **: p < 0.01). Abbreviations: QFT = QuantiFERON-TB Gold In-Tube.
