3.2 Linear Regression Analysis
In linear regression analysis, the LDIs showed the strongest correlation with conventional PFTs (Table 2). Specifically, the FEV1 and sRaw showed a significant correlation with LDIs. MLDD (p = 0.015), E/I MLD (p = 0.018), and E/I volume (p = 0.004) showed a statistically significant correlation with FEV1. The indicators that showed a correlation with sRaw were E/I Volume (p = 0.025), E850, E900, and E950 (all p < .001). EXP MLD (p = 0.019), E600, and E650 (all p < .001), which are indicators related to air trapping during exhalation, showed statistically significant correlation with RV.