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Table 3 The possible reasons for the high variability of epidemiological parameters observed in the different studies

From: Idiopathic pulmonary fibrosis - a systematic review on methodology for the collection of epidemiological data

Epidemiological parameter Reason for variability
Prevalence Definition of disease
Diagnostic guidelines
Healthcare system related
Methodological differences
Incidence Improved diagnostics
Improved health care system
Ageing population
Drug availability
Mortality Clinical recognition
Changes in diagnostic coding
M/F ratio Occupational exposures
  Population smoking habits