Table 3.

Age-adjusted standardized incidence rate of Idiopathic pulmonary fibrosis (IPF), and non-IPF interstitial lung disease (ILD) and lung cancer from combined registries, compared to Department of Health lung cancer registry and Pennsylvania census data, based on 1000 person-year for each expected and observed age group. Observed incidence of lung cancer in general population was calculated within different age brackets, as well as lung cancer occurrence in IPF and ILD population

	Registry IPF and LC over population	Registry non-IPF ILD and LC over population
Case number	Observed / Expected cases	Observed / Expected cases
	31 / 9.28	16 / 7.05
SIR (95% CI)	3.34 (2.31–4.68)	2.27 (1.34–3.61)

Definition of abbreviations: SIR standardized incidence ratio, CI confidence interval, IPF idiopathic pulmonary fibrosis, LC lung cancer