Skip to main content

Table 1 Characteristics of the included studies-Part I

From: The risk of rheumatoid arthritis among patients with inflammatory bowel disease: a systematic review and meta-analysis

Study Country Design/study duration Sample source Definition criteria  
IBD RA
Aletaha-2019 [17] USA Retrospective Cohort/10 years MarketScan Commercial Claims and Encounters database ≥2 claims at least 30 days apart with ICD-9 codes (555.x, 556.x) ≥2 claims at least 30 days apart with ICD-9 codes (714, 714.0, 714.8, 714.89, 714.9)
Bae-2017a [14] Korea Cross-sectional/NA National Health Insurance Database ≥5 health contacts due to UC/ CD as the principal diagnosis with ICD-9 codes (K50, K51) ≥5 health contacts due to RA as the principal diagnosis with ICD-9 codes (M05, M06)
Burisch-2019 [16] Denmark Retrospective Cohort/10 years National
Patient Registry
≥2 diagnoses with ICD-8 codes (563.01, 563.19) or ICD-10 codes (K50, K51) ≥1 diagnosis with ICD-10 codes (M05, M06.0, M06.8, M06.9)
Cohen-2008-1 [16] USA Cross-Sectional/ NA IMS Health Integrated Administration Claims Database ≥1 claim with ICD-9 codes (555.x, 556.x) ≥1 claim with ICD-9 codes (714.x)
Cohen-2008-2 [13] USA Cross-Sectional/ NA MarketScan Commercial Claims and Encounters Database ≥1 claim with ICD-9 codes (555.x, 556.x) ≥1 claim with ICD-9 codes (714.x)
Halling-2017a [12] Denmark Cross-Sectional/ NA National
Patient Registry
ICD-10 codes (K50, K51) ICD-10 codes
Kappelman-2011 [11] USA Cross-Sectional/ NA PharMetrics Patient-Centric Database ≥3 health contacts with associated ICD-9 codes (555.x, 556.x), or ≥ 1 claim with associated medication history ICD-9 codes
Park-2019 [15] Korea Retrospective cohort/4 years National Health Insurance Database ICD-10 codes (K50, K51) and registration codes (V130, V131) for the rare/intractable disease patient-support program ICD-10 codes and registration codes for the rare/intractable disease patient-support program
Puolakka-2014 [19] Finland Case-control/4 years National Registry of the Social Insurance Institution ICD-10 codes (K50, K51) ICD-10 codes (M05, M06)
Kronzer-2019 [18] USA Case-control/10 years Single-center biobank Questionnaire ≥2 diagnoses at least 30 days apart with ICD-9 codes (714.0, 714.9) plus use of a disease modifying antirheumatic drug
Weng-2007 [10] USA Cross-sectional/NA Northern California region of the Kaiser Permanente Medical Care Plan ≥2 diagnoses with ICD-9 codes (555.x, 556.x) ≥2 diagnoses with ICD-9 codes (714.0, 714.3x)
Yang-2018a [9] Korea Cross-Sectional/NA National Health Insurance Database ICD-10 codes (K50, K51) and registration codes (V130, V131) for the rare/intractable disease patient-support program ICD-10 codes (M05, M06)
  1. CD Crohn Disease, IBD Inflammatory Bowel Diseases, NM Not Mentioned, ICD-8 International Classification of Disease 8th revision, ICD-9 International Classification of Disease 9th revision, ICD-10 International Classification of Disease 10th revision, NA Not Apply, RA Rheumatoid Arthritis, UC Ulcerative Colitis
  2. aThese cross-sectional studies were not included in the statistical meta-analysis as the populations in these studies overlapped with those in the other cohort studies