Table 1.
Characteristics of the case-control studies included in the meta-analysis on the association between OC use and BrCa risk.
| First Autor Pub Year (References) | Region | Recruitment (Year) | Number of Case Subjects (%) | Age (Mean ± SD or Range) | Number of Controls Subjects (%) | Source of Subjects | NOS Score |
|---|---|---|---|---|---|---|---|
| Engbang 2020 [26] | Duala; Cameroon | 2012–2018 | 297 (50.5) | 53.3 ± 12.7 | 1158 (36.7) | Hospital | 8 |
| Hamdi-Cherif 2020 [27] | Setif; Algeria | 2012–2017 | 547 (63.1) | 28–77 | 543 (59.1) | Hospital | 4 |
| Alipour 2019 [28] | Golestan; Iran | 2004–2008 | 99 (34.3) | 40–75 | 400 (33.2) | Population | 8 |
| Alsolami 2019 [29] | Mahhah; Saudi Arabia | 2014–2016 | 214 (43.9) | 57.0 ± 7.3 | 218 (25.2) | Population | 5 |
| Andarieh 2019 [30] | Babolsar; Iran | 2014–2016 | 1177 (58.5) | 48.8 ± 8.5 | 1204 (27.3) | Hospital | 7 |
| Yuan 2019 [31] | Chengdu; China | 2014–2015 | 448 (19.2) | 43.7 ± 6.1 | 463 (10.6) | Clinic | 5 |
| Bashamakha 2019 [32] | Seiyun; Yemen | 2011–2015 | 105 (49.5) | N/A | 210 (55.2) | Population | 6 |
| Wahidin 2018 [33] | Jakarta; Indonesia | 2018 | 381 (35.4) | 40–49 | 381 (20.2) | Hospital | 4 |
| Khalis 2018 [34] | Fez; Morocco | 2014–2015 | 237 (62.2) | 45–54 | 237 (61.2) | Hospital | 6 |
| Sofi 2018 [35] | New Delhi; India | 2015–2017 | 195 (12.3) | 45.0 ± 10.0 | 191 (25.1) | Hospital | 7 |
| Tan 2018 [36] | Malaysia | 2002–2016 | 3387 (27.6) | 58.0 | 3951 (29.0) | Hospital | 4 |
| Ellingjord-Dale 2017 [37] | Norway | 2006–2014 | 5050 (51.6) | 50–69 | 24,343 (50.7) | Population | 8 |
| Balekouzou 2017 [38] | Central African Republic | 2003–2015 | 174 (28.9) | 45.8 ± 13.6 | 348 (41.1) | Population | 6 |
| Kariri 2017 [39] | Gaza Strip; Palestine | 2014–2015 | 96 (28.1) | 18–60 | 197 (28.9) | Hospital | 7 |
| Dianatinasab 2017 [40] | Shiraz; Iran | 2014–2016 | 526 (46.8) | <40–60> | 562 (40.7) | Hospital | 7 |
| Chollet-Hinton 2017 [41] | USA | 2005 | 1589 (80.7) | 22–75 | 5137 (86.1) | Community | 7 |
| Nguyen 2016 [42] | Hanoi; Wietnam | 2007–2013 | 291 (8.6) | 24–65 | 291 (4.5) | Hospital | 7 |
| Wang 2016 [43] | Hong Kong SAR | 2011–2015 | 923 (32.6) | 56.0 ± 11.8 | 918 (36.3) | Hospital | 6 |
| Al-Amri 2015 [44] | Riyadh; Saudi Arabia | 2013–2014 | 58 (62.1) | 30–69 | 290 (73.8) | Hospital | 6 |
| Ichida 2015 [45] | Tokyo; Japan | 2007–2013 | 155 (23.2) | 20–69 | 12,223 (26.8 | Clinic | 6 |
| Karim 2015 [46] | Jeddah; Saudi Arabia | 2001–2013 | 92 (58.7) | 30–65 | 100 (67.0) | Clinic | 4 |
| Mohite 2015 [47] | Satara district, India | 2009–2011 | 217 (31.8) | 40–49 | 217 (22.1) | Hospital | 4 |
| Laamiri 2015 [48] | Rabat; Morocco | 2008–2010 | 400 (74.5) | 45.8 ± 11.1 | 400 (76.0) | Hospital | 5 |
| Kawai 2014 [49] | USA | 2004–2010 | 960 (88.9) | 20–44 | 938 (89.1) | Population | 6 |
| Work 2014 [50] | USA, Canada, Australia | 1995–2004 | 4011 (72.9) | 18–69 | 2997 (77.8) | Community | 6 |
| Beaber 2014 [51] | USA | 2004–2010 | 985 (87.9) | 20–44 | 882 (88.3) | Population | 7 |
| Hosseinzadeh 2014 [52] | Tabriz; Iran | 2012–2013 | 140 (69.3) | 47.6 ± 10.7 | 280 (38.6) | Clinic | 4 |
| Vaisy 2014 [53] | Urmia; Iran | 2013–2014 | 228 (72.4) | 47.63 | 216 (57.4) | Clinic | 5 |
| Pimhanam 2014 [54] | Bangkok; Thailand | 2007–2011 | 444 (45.9) | 45.8 ± 10.1 | 444 (38.7) | Hospital | 4 |
| Sepandi 2014 [55] | Shiraz; Iran | 2001–2012 | 197 (57.9) | 26–68 | 11,653 (55.8) | Hospital | 4 |
| Tazhibi 2014 [56] | Isfahan; Iran | 1999–2010 | 216 (63.9) | 20–75 | 41 (75.6) | Hospital | 5 |
| Amadou 2014 [57] | Mexico | 2004–2007 | 263 (17.9) | 35–64 | 314 (19.4) | Hospital | 6 |
| Morales 2013 [58] | Puerto Rico | 2005–2009 | 462 (48.5) | 56.4 ± 12.6 | 649 (55.0) | Hospital | 6 |
| Ehsanpour 2013 [59] | Isfahan; Iran | 2011 | 175 (43.4) | <41–60+ | 350 (25.4) | Clinic | 5 |
| Urban 2012 [60] | South Africa | 1995–2006 | 1112 (23.0) | 49.0 | 1102 (14.2) | Hospital | 4 |
| Ronco 2012 [61] | Montevideo; Uruguay | 2004–2010 | 251 (69.7) | <30–50≥ | 497 (65.2) | Hospital | 8 |
| Matalqah 2011 [62] | Penang, Malaysia | 2009–2010 | 150 (26.7) | 52.8 ± 1.1 | 150 (18.0) | Population | 7 |
| Ghiasvand 2011 [63] | Shiraz; Iran | 2005–2008 | 442 (66.3) | 41.2 ± 5.7 | 463 (62.9) | Hospital | 5 |
| Ekpanyaskul 2010 [64] | Khon Kaen, Thailand | 2002–2004 | 516 (42.0) | 46.9 ± 10.6 | 516 (34.9) | Hospital | 6 |
| Ma 2010 [65] | USA | 1994–1998 | 1197 (78.8) | 36–64 | 2015 (79.6) | Community | 8 |
| Hahjisavvas 2010 [66] | Cyprus | 1999–2005 | 1103 (25.4) | 50–59 | 1173 (25.1) | Hospital | 7 |
| Ozmen 2009 [67] | Istanbul, Turkey | 2000–2006 | 1492 (18.4) | 18–70 | 2167 (27.8) | Hospital | 7 |