|
| References; year of publication | Country | Study design | Sample | Diagnosis time/age/duration of psoriasis | Subject | Confounder adjustment | Quality assessment (Newcastle-Ottawa Score) |
|
| Ahn et al. [27]; 2019 | Korea | Cross-sectional study | 182,127 (42,641 diagnosis/139,486 comparison) including 21,899 children (<18) | Not mentioned | Diagnosis: patients with psoriasis were identified from the Korean National Health Insurance Research Database in 2015 | Age, gender | Selection: 3 comparability: 1 outcome: 3 |
| Comparison: sex and age-matched comparisons without psoriasis were randomly selected from the same database |
|
| Kara et al. [16]; 2019 | Turkey | Case-control study | 108 (54 cases/54 controls) including 215 children (<18) | Diagnosis duration of psoriasis: at least 3 months | Cases: patients with psoriasis were identified from the University of Health Sciences, Bakirkoy Dr. Sadi Konuk Training and Research Hospital Dermatology Department | Age, gender, and comorbidities | Selection: 3 comparability: 2 outcome: 3 |
| Controls: sex and age-matched controls without psoriasis were randomly selected from the same department |
|
| Leisner et al. [29]; 2019 | Denmark | Case-control study | 154,715 (13,675 cases/141,040 controls) including 76,980 female adults; 78,400 male adults; and 7,297 children (<18) | Diagnosis age of psoriasis: | Cases: patients with psoriasis identified from all Danish hospitals between 1900 and 1995 | Age, gender, birth year, age at first psoriasis diagnosis, education, and comorbidities | Selection: 3 comparability: 2 outcome: 3 |
| 0–19; | Controls: sex and age-matched controls without psoriasis were randomly selected from the same hospital |
| 20–39; |
| 40–59; |
| 60–79; |
| ≥80 |
|
| Raikhy et al. [22]; 2017 | India | Case-control study | 1,089 (89 cases/1,000 controls) | Not mentioned | Cases: patients with psoriasis identified from Psychiatry Department of NIMS Medical College | Age, gender, marital status, religion, education, and occupation | Selection: 3 comparability: 2 outcome: 3 |
| Controls: sex and age-matched controls without psoriasis were randomly selected from the same department |
|
| Tu et al. [21]; 2017 | Taiwan | Cross-sectional study | 778,123 (10,796 diagnosis/767,327 comparison) including 403,565 female adults; 379,532 male adults | Diagnosis time: with psoriasis during the period from January 1, 1997 to December 31, 2010 | Diagnosis: patients with psoriasis identified from Taiwan’s National Health Insurance Research Database | Age, gender, comorbidities, and duration | Selection: 3 comparability: 1 outcome: 3 |
| Comparison: sex and age-matched comparisons without psoriasis were randomly selected from the same database |
|
| Patel et al. [28]; 2019 | USA | Case-control study | 87,053,095 (188,089 cases/86,865,066 controls) including 53,907,819 female adults; 38,341,356 male adults; and 15,004,737 children (<18) | Diagnosis duration of psoriasis: 5–10 years | Cases: patients with psoriasis identified from the National Inpatient Sample of all US hospitalizations between 2002 and 2012 | Age, gender, and race | Selection: 3 comparability: 2 outcome: 3 |
| >10 years | Controls: sex and age-matched controls without psoriasis were randomly selected from the same sample |
|
| Parisi et al. [15]; 2017 | U.K. | Cohort-comparison study | 933,880 (56,961 patients/876,919 comparison) | Not mentioned | Cohort: patients with psoriasis identified from the Clinical Practice Research Datalink linked to Hospital Episode Statistics and the Office for National Statistics mortality records in England between 1998 and 2014 | Age, sex, and general practice | Selection: 3 comparability: 1 outcome: 3 |
| Comparison: sex and age-matched controls without psoriasis were randomly selected from the same cohort |
|
| Schmitt and Ford [14]; 2010 | Germany | Case-control study | 6294 (3,147 cases/3,147 controls) including 3,528 female adults; 6,377 male adults | Not mentioned | Cases: patients with psoriasis identified from an interdisciplinary administrative healthcare database | Age, sex, personal income, and comorbidities | Selection: 3 comparability: 2 outcome: 3 |
| Controls: sex and age-matched controls without psoriasis were randomly selected from the same cohort |
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