Table 2. Sensitivity analysis to identify the effect of each study on polled estimate.

Authors	Prevalence (95% CI)
Riazi Esfahani et al[10]	0.269 (0.211-0.326)
Nakshab et al[11]	0.266 (0.208-0.324)
Karkhaneh et al[12]	0.266 (0.207-0.325)
Mansouri et al[13]	0.259 (0.200-0.318)
Karkhaneh et al[14]	0.257 (0.198-0.316)
Fayyazi et al[15]	0.268 (0.212-0.325)
Khatami et al[16]	0.260 (0.201-0.318)
Mousavi et al[17]	0.255 (0.197-0.314)
Riazi-Esfahani et al[18]	0.266 (0.207-0.324)
Sadeghi et al[19]	0.264 (0.205-0.323)
Fouladinejad et al[20]	0.269 (0.211-0.327)
Mousavi et al[21]	0.255 (0.197-0.313)
Naderian et al[22]	0.264 (0.204-0.325)
Saeidi et al[23]	0.267 (0.209-0.326)
Bayat-Mokhtari et al[24]	0.254 (0.196-0.312)
Mousavi et al[25]	0.256 (0.197-0.315)
Naderian et al[26]	0.264 (0.204-0.324)
Ebrahim et al[27]	0.263 (0.204-0.322)
Ghaseminejad and Niknafs[28]	0.259 (0.201-0.318)
Naderian et al[29]	0.257 (0.198-0.315)
Afarid et al[30]	0.256 (0.197-0.315)
Feghhi et al[31]	0.258 (0.199-0.318)
Abrishami et al[32]	0.260 (0.202-0.319)
Sabzehei et al[33]	0.264 (0.204-0.324)
Ahmadpour-kacho et al[34]	0.243 (0.191-0.294)
Rasoulinejad and Montazeri[35]	0.253 (0.196-0.309)
Combined	0.261 (0.203-0.318)

CI: Confidence interval.