Table 1 Characteristics of included studies
Author | Country | Year | N of cases | N of controls | Average age of casesa | Average age of controlsa | Disease durationa | Study type | Diagnosis criteria for SLE | Results of quality assessment |
|---|---|---|---|---|---|---|---|---|---|---|
Wu J [9] | China(A) | 2018 | 338 | 1014 | 29.5 | 29.7 | 5.6 | Retro-cohort | ACR | 8 |
Abdwani R [10] | Oman(A) | 2018 | 56 | 91 | 31.0 | 29.0 | NA | Retro-cohort | ACR | 8 |
Phansenee S [14] | Thailand (A) | 2017 | 133 | 1394 | 29.5 | 27.4 | NA | Retro-cohort | NA | 7 |
Galappatthy P [15] | Sri Lanka (A) | 2017 | 79 | 85 | 25.9 | NA | 8.0 | Retro-case-control | ACR | 7 |
Yan Yuen [22] | Canada | 2008 | 108 | 134 | 42.0 | 38.0 | 15.0 | Retro-case-control | ACR | 8 |