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. 2018 Jan 18;16:18. doi: 10.1186/s12955-018-0845-7

Table 1.

Main characteristics of the studies included in the current systematic review and meta-analysis

Author Year City Province Sample size Mean
Ghaderi 2014 Tabriz East Azerbaijan 56 51.64
Farhadi 2011 Bushehr Bushehr 69 32.1
Abdoli 2012 Tehran Tehran 80 67.04
Shirvani 2016 Borujen Chaharmahal and Bakhtiari 80 70.06
Naseh 2014 Shahrekord Chaharmahal and Bakhtiari 87 41.56
Jadidi 2015 Tehran Tehran 141 50.36
Abdollahi 2013 Sari Mazandaran 153 70.39
Aghanuri 2012 Arak Markazi 165 55.66
Mohammadiannia 2013 Bushehr Bushehr 173 56.41
Heravi-Karimooi 2013 Tehran Tehran 180 66.49
Salehi 2012 Tehran Tehran 203 72.1
Heydari 2012 Sari Mazandaran 220 46.031
Hedayati 2014 Shiraz Fars 220 50.76
Hekmatpou 2014 Arak Markazi 269 50.22
Zahmatkeshan 2012 Bushehr Bushehr 360 47.75
Nejati 2008 Kashan Isfahan 389 62.35
Vahdaninia 2005 Tehran Tehran 396 53.9
Tajvar 2008 Tehran Tehran 400 59.43
Darvishpoor Kakhki 2013 Tehran Tehran 400 45.24
Salarilak 2013 Kamyaran Kurdistan 400 60.62
Farzianpour 2016 Tehran Tehran 400 49.7
Rakhshani 2014 Shiraz Fars 500 50.8
Babak 2016 Isfahan Isfahan 637 54.64
Hajian-Tilaki 2017 Babol Mazandaran 750 56.8
Abbasimoghadam 2009 Tehran Tehran 5600 51.589