Table 1 Characteristics of the included studies-Part I
Study | Country | Design/study duration | Sample source | Definition criteria | Â |
|---|---|---|---|---|---|
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) |