Table 2.
The prevalence rate in different studies
| Prevalence | Sample group | Location | Year | Author |
|---|---|---|---|---|
| 19.2% | 7-10 year-old students | Sari | 1999 | A. Farhadi |
| 61.6% | Referred to health centers | Kerman | 2000 | M. Zahedi |
| 64.2% | General population | Sari | 2002 | F. Baba Mahmoudi |
| 77.8% | Referred to Imam Reza Hospital Laboratory | Mashhad | 2006 | Z. Siadat |
| 36.5% | The population over 10 years old | Kurdistan | 2006 | K. Yazdanpanah |
| 15.3% | 2-12 years old children admitted to Ghods hospital | Ghazvin | 2006 | A. Mahyar |
| 76.4% | General population | Izeh | 2008 | A. Holaku |
| 58.5% | General population | Arak | 2011 | A. Fani |
| 74% | Referred to health centers | Sari | 2013 | M. Owrang |