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. 2019 Nov 14;19:286. doi: 10.1186/s12883-019-1473-5

Table 1.

Characteristics of included studies

First author Published year Country Type of study No case/No control OR(95% CI)
Ramagopalan [15] 2009 CANADA case-control 4472/ 1101 0.89(0.83-0.94)
Salehi [12] 2018 Iran case-control 399/541 0.92(0.84-0.99)
Rejali [16] 2016 Iran case-control 200/ 200 0.78(67-0.89)