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Summary of studies characteristics
| No | First author | Year | Sample size | Location | Correlation | Z score | P-value |
|---|---|---|---|---|---|---|---|
| 1 | Khodabakhshi | 2016 | 140 | Semnan | -0/685 | -0/838 | <0/0001 |
| 2 | Momeni | 2010 | 426 | Kermanshah | -0/602 | -0/708 | <0/0001 |
| 3 | Amini | 2013 | 304 | Tehran | -0/355 | -0/371 | <0/001 |
| 4 | Arbabshastan | 2014 | 175 | Shiraz | -0/208 | -0/211 | <0/0001 |
| 5 | Shakerinia | 2010 | 124 | Rasht | -0/806 | -1/112 | <0/0001 |
