Author, year, Reference | Place of study | sample size | Mean ± SD of Before | Mean ± SD of 3 months | Mean ± SD of 6 months | Quality |
---|---|---|---|---|---|---|
Suksompong, 2012, [9] | Thailand | 15 | 2.11 | 0.74 | – | High |
Ergun, 2015, [11] | Turkey | 12 | 1.18 ± 1.07 | 1.00 ± 1.01 | – | High |
Hwu, 2011, [12] | Taiwan | 147 | 1.7 | 1.03 | – | High |
Chang, 2010, [13] | Korea | 20 | 2.18 | 0.95 | – | Medium |
Adnyana, 2018, [15] | Indonesia | 35 | 2.07 ± 1.18 | 1.44 ± 0.87 | – | High |
Sumapraja, 2011, [24] | Indonesia | 22 | 1.64 | 0.6 | – | High |
Salihoğlu, 2016, [17] | Canada | 34 | 2.60 ± 2.30 | 2.20 ± 1.9 | – | High |
Alborzi, 2014, [6] | Iran | 193 | 2.60 ± 1.98 | 1.07 ± 0.97 | – | High |
Tanprasertkul, 2014, [25] | Thailand | 39 | 2.01 | 1.60 | 1.68 | High |
El-Dorf-2, 2015, [18] | Egypt | 50 | 2.90 ± 0.40 | 1.70 ± 0.30 | 1.6 ± 0.12 | High |
El-Dorf-2, 2015, [18] | Egypt | 80 | 1.90 ± 0.24 | 1.30 ± 0.10 | 0.97 ± 0.11 | High |
Saito, 2018, [20] | Japan | 37 | 3.1 ± 1.7 | – | 0.8 ± 0.7 | High |
Marshall, 2019, [21] | Sudan | 39 | 3.19 | – | 0.88 | Medium |
Shao, 2016, [22] | China | 36 | 4.68 ± 2.87 | – | 3.05 ± 1.99 | High |
Zaitoun, 2013, [26] | Egypt | 61 | 4.50 ± 0.80 | – | 2.40 ± 0.50 | Medium |
Celik, 2012, [23] | Turkey | 39 | 2.20 | – | 0.55 | High |