Table 1 Patients’ characteristics.

From: Assessment of diagnostic utility of serum hemeoxygenase-1 measurement for acute exacerbation of interstitial pneumonias

Variable

IIPs

AE vs. no AE

SIPs

AE vs. no AE

AE (N = 32)

No AE (N = 58)

AE (N = 9)

No AE (N = 23)

Age (y)

77 (70.8–80.3)

76 (69.5–82)

0.671

72 (66–77)

69 (62–77)

0.442

Sex (Male)

26 (81)

48 (83)

0.760

3 (33)

7 (30)

0.712

CCIS

3 (2–5.5)

2 (1–3.5)

0.061

2 (1–3)

3 (1–5)

0.549

IP subtype

  

0.798

  

0.181

IPF

18 (56)

31 (53)

    

Non-IPF IIPs

14 (44)

27 (47)

    

CVD-IPs

   

9 (100)

19 (83)

 

Others

   

0 (0)

4 (17)

 

Biomarkers

LDH, IU/L

276 (233–352)

202 (190–235)

 < 0.001

265 (201–394)

246 (180–289)

0.367

SP-D, ng/mL

210 (90–325)

129 (88–263)

0.199

214 (153–291)

176 (149–212)

0.386

KL-6, U/mL

775 (341–1455)

617 (339–882)

0.281

1249 (657–2358)

905 (553–1956)

0.593

HO-1, ng/mL

34.3 (25.3–53.0)

15.5 (10.2–24.1)

 < 0.001

41.8 (21.9–53.3)

17.1 (12.1–22.0)

0.002

HRCT scores

      

Honeycomb

3 (0–8)

3 (0–6)

0.706

3 (0.5–7)

1 (0–4)

0.210

GGO

8 (7–11)

2 (2–4)

 < 0.001

8 (4–17)

3 (2–5)

0.016

  1. AE, acute exacerbation; CCIS, Charlson Comorbidity Index score; CVD, collagen vascular disease; GGO, ground-glass opacity; HO-1, heme oxygenase-1; HRCT, high-resolution computed tomography; IIPs, idiopathic interstitial pneumonias; IP, interstitial pneumonia; IPF, idiopathic pulmonary fibrosis; KL-6, Krebs von den Lungen-6; LDH, lactate dehydrogenase; SIPs, secondary interstitial pneumonias; SP-D, surfactant protein-D.