Fig. 2
From: Small airway dysfunction in pneumoconiosis: a cross-sectional study
The prevalence of small airway dysfunction in various subtypes of pneumoconiosis and total patients. A p values for women versus men, B p values for comparison across stages of pneumoconiosis, C p values for FEV1 ≥ 80% and FEV1/FVC ≥ 70% group versus others, D p values for FVC ≥ 80% and FEV1/FVC ≥ 70% group versus others. SAD small airway dysfunction; *, p < 0.05; **, p < 0.01; ***, p < 0.001