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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