the first citation needed under the epidemiology section comes from luhr or antonsen k karlsson m incidence and mortality after acute respiratory failure and acute respiratory distress syndrome in sweden denmark and iceland the arf study group am j respir crit care med jun however the statement above mine is correct and the actual figure is acually around in person years from rubenfeld gd caldwell e peabody e weaver j martin dp neff m incidence and outcomes of acute lung injury n engl j med oct