Table 2 Characteristics of case–control and cross-sectional studies
Citation | Country | Study period | Study design | Effect estimates | Study population (n) | Diagnosis criteria | |
|---|---|---|---|---|---|---|---|
Endometriosis | Autoimmune disease | ||||||
Matorras et al. (2007) [27] | Spain | 1990- 2004 | Case–control study | SLE: OR = 2.9 (95%CI:0.27–32.57) P > 0.05 SS: OR、95%CI:not calculable P > 0.05 | Case: 342 Control: 501 | Histology | Clinical interview and medical records according to the ACR criteria |
Yoshii et al. (2021) [31] | Japan | 2011- 2018 | Case–control study | SLE: IRR = 1.35 (95%CI:0.99–1.84) RA: IRR = 1.31 (95%CI:1.05–1.64) | Case: 30,516 Control: 120,976 | ICD-10-CM | ICD-10-CM |
Porpora et al. (2019) | Italy | 2014- 2017 | Retrospective case–control study | SLE: OR = 8.63 (95%CI:1.07–69.91) P = 0.01 | Case: 148 Control: 150 | Laparoscopy and histology | Antinuclear antibodies, extractable nuclear antigen, anti-cardiolipin antibodies, antiphospholipid antibodies, and lupus anticoagulant |
Sinaii et al. (2002) [30] | USA, Canada | 1988 | Cross-sectional study | SLE: OR = 20.7 (95%CI:14.3–29.9) P < 0.0001 RA: OR = 1.5 (95%CI:1.2–1.9) P = 0.001 SS: OR = 23.9 (95%CI:15.5–36.5) P < 0.0001 | Study sample: 3680 | Self-reports of laparoscopy/laparotomy | Self-reported physician diagnosis |