Fig. 1

The number of pulmonary fibrosis deaths in Finland between the years 1998–2015 “http://www.stat.fi/til/ksyyt/2015/ksyyt_2015_2016-12-30_tau_001_en.html”. Underlying cause of death according to J84 (ICD-10, 3-character level): The data of this time series is otherwise comparable, but the classification of pneumonia was altered in 2005 and 2006. From that time onwards, an international guideline was adopted. Accordingly, pneumonia is not accepted as the underlying cause of death if a chronic disease which has weakened the individual, is mentioned in the death certificate. In such cases, the disease in question is recorded as the person’s underlying cause of death. The revision of the classification was gradually taken into use in 2005 and 2006 “http://www.stat.fi/til/ksyyt/2015/ksyyt_2015_2016-12-30_tau_001_en.html”