CD19 and pulmonary emphysema: On multivariable logistic analysis, statistically significant independent associations were observed between low CD19 and pulmonary sarcoidosis (odds ratio, 5.53; 95% CI, 1.43–21.33; p = 0.013), and emphysema (odds ratio, 4.58; 95% CI, 1.36–15.38; p = 0.014).