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Table 2 Comparison of pulmonary function indexes among groups

From: Development of a nomogram for predicting the presence of combined pulmonary fibrosis and emphysema

Pulmonary function indexes (IQR) All patients (N = 213) CPFE (N = 85) IPF (N = 128) P value
RV (L) 1.9 (1.6–2.3) 2.1 (1.8–2.5) 1.7 (1.4–2.1) 0.000*
RV%pred 80.3 (69.8–93.5) 82.2 (74.5–99.0) 79.1 (65.2–90.5) 0.042*
VC (L) 2.5 (1.9–3.0) 2.9 (2.3–3.3) 2.1 (1.6–2.7) 0.000*
VC%pred 76.3 (66.7–87.2) 81 (70.1–92.0) 72.8 (64.2–85.1) 0.028*
VA (L) 4.1 (3.2–5.0) 4.8 (3.9–5.3) 3.9 (2.8–4.7) 0.000*
VA%pred 72.3 (63.1–82.3) 76.4 (65.5–83.3) 70.0 (59.8–79.1) 0.118
TLC (L) 4.3 (3.4–5.1) 5 (4.1–5.5) 3.9 (3.1–4.9) 0.000*
TLC%pred 73.3 (65.1–80.6) 77.8 (69.3–84.5) 70.2 (61.0–77.8) 0.002*
FVC (L) 2.4 (1.8–3.0) 2.9 (2.3–3.2) 2.1 (1.6–2.7) 0.000*
FVC%pred 78.1 (67.8–88.4) 81.5 (71.4–93.0) 74.4 (65.5–83.1) 0.013*
FEV1 (L) 1.9 (1.4–2.3) 2.1 (1.7–2.5) 1.7 (1.3–2.2) 0.001*
FEV1%pred 79.0 (66.9–93.6) 79.2 (69.3–91.1) 79.0 (65–94.8) 0.624
FEV1/FVC (%) 82.1 (76.0–87.0) 79.2 (71.5–84.1) 84.4 (78.6–88.5) 0.000*
DLCO/VA (mol/min/kPa/L) 1.2 (0.8–1.5) 1.1 (0.8–1.4) 1.3 (1.0–1.5) 0.021*
DLCO/VA%pred 78.05 (63.35–97.75) 76.3 (59.5–94.1) 86.3 (69.6–98.5) 0.066
  1. *P < 0.05