Fig. 2

Trends in the multivariable-adjusted odds ratios for hemoptysis according to MAC-Ab levels. OR, odds ratio; MAC-Ab, antibody against the Mycobacterium avium complex. ^*P < 0.05 versus the reference group. a The seropositive and seronegative groups were defined as the subjects with MAC-Ab levels of ≥0.7 U/ml and < 0.7 U/ml, respectively. b The study subjects were divided into three groups based on the tertile distribution of MAC-Ab titers as follows: lowest (reference), < 0.9 U/ml; middle, 1.0–4.4 U/ml; and highest, ≥ 4.5 U/ml. In both a and b, adjustments were made for age, gender, BMI, nodular bronchiectatic disease, fibrocavitary disease, and the number of NTM species identified