Table 3.

Variables associated with mortality in the patient cohort

	Unadjusted	Adjusteda
	HRR (95% CI)	HRR (95% CI)
Age (per 10 years)	1.92 (1.49–2.48)	1.91 (1.45–2.52)
Smoking (ever)	1.97 (1.14–3.40)	1.24 (0.71–2.18)
Ischemic heart disease	2.16 (1.30–3.59)	1.09 (0.64–1.86)
DLCO (10 units)	0.70 (0.55–0.89)	0.72 (0.35–0.97)
N-Acetylcysteine
Low dose	2.15 (1.22–3.89)	1.74 (0.98–3.09)
High dose	2.60 (1.27–5.30)	2.88 (1.37–6.08)

HRR, hazard risks ratio.

^aadjusted for age and smoking status.