Fig. 2

a Study time windows to exclude prevalent ILD and other pulmonary conditions to find incident ILD, event date occurring >365 days after the RA Cohort Index Date. * For the incident ILD algorithm, in addition to the exclusions for autoimmune disease and malignancy shown above, additional exclusions were made for Specific ILD Codes (exhaustive list in Supplemental Table 1) plus ICD-9-CM 135 (Sarcoidosis), and ICD-10-CM D86.9 (Sarcoidosis). The red box indicates a 6-month interval of time during which ILD-related diagnoses can accrue, even if the patient has not yet met ILD case qualifying criteria. ILD, interstitial lung disease. b Study time windows to exclude prevalent ILD and other pulmonary conditions to find incident ILD identified within 365 days of eligibility for the RA Cohort. *Incident ILD cases could occur even if the date fulfilling the ILD algorithm was within the +365 day period following the RA cohort index date. The Prevalent ILD Exclusion Time Window is applied prior to the RA Cohort Index date, and this step will exclude prevalent ILD cases. The red box indicates a 6-month interval of time during which ILD-related diagnoses can accrue. ** For incident ILD algorithm, in addition to the exclusions for autoimmune disease and malignancy, additional exclusions were made for Specific ILD Codes (exhaustive list in Supplemental Table 1) plus ICD-9-CM 135 (Sarcoidosis), and ICD-10-CM D86.9 (Sarcoidosis). ILD, interstitial lung disease