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Subgroup analysis of risk ratio based on whether the participants were healthcare workers
| Subgroup | Risk ratio | 95% Confidence interval |
|---|---|---|
| Study participants | ||
| Healthcare worker group | ||
| Soylu (2014), Turkey | 2.15 | 0.28–16.20 |
| Seyedmehdi (2016), Iran | 0.73 | 0.43–1.25 |
| Aydin Guclu (2019), Turkey | 1.48 | 0.99–2.22 |
| Subtotal | 1.13 | 0.62–2.04 |
| Non-Healthcare worker group | ||
| Walia (2012), USA | 1.03 | 0.92–1.15 |
| Yazdi (2014), Iran | 0.86 | 0.44–1.67 |
| Subtotal | 1.03 | 0.92–1.44 |
