Table 1 Critical appraisal of the included studies
Author, Year | Q1 | Q2 | Q3 | Q4 | Q5 | Q6 | Q7 | Q8 | Quality Assessment |
|---|---|---|---|---|---|---|---|---|---|
Abhishek 2014 [73] | N | U | Y | Y | N | N | Y | N | Low quality |
Abhishek 2016 [74] | N | U | Y | Y | N | N | Y | N | Low quality |
Ajai 2020 [57] | Y | Y | Y | Y | N | N | Y | Y | Medium quality |
Appukuttan 2016 [58] | Y | Y | N | N | N | N | Y | Y | Medium quality |
Babu 2017 [59] | Y | Y | Y | Y | N | N | Y | Y | Medium quality |
Baiju 2019 [38] | Y | Y | Y | U | N | N | Y | Y | Medium quality |
Basavaraj 2014 [60] | Y | Y | Y | Y | N | N | Y | Y | Medium quality |
Ghanghas 2019 [61] | Y | Y | Y | Y | N | N | Y | Y | Medium quality |
Jaggi 2019 [62] | Y | Y | Y | Y | N | N | Y | Y | Medium quality |
Jain 2012 [75] | N | N | Y | U | U | U | U | U | Low quality |
Joseph 2016 [63] | Y | Y | Y | Y | U | U | Y | Y | Medium quality |
Kumar 2015 [41] | Y | Y | Y | Y | Y | Y | Y | Y | High quality |
Kumar 2018 [55] | Y | Y | Y | Y | Y | N | Y | Y | High quality |
Manjith 2012 [64] | Y | Y | Y | Y | N | N | Y | U | Medium quality |
Marina 2019 [76] | U | N | N | N | N | N | N | N | Low quality |
Mary 2019 [56] | Y | Y | Y | Y | Y | N | Y | Y | High quality |
Marya 2020 [42] | Y | Y | U | Y | Y | Y | Y | Y | High quality |
Nagarajappa 2015 [43] | Y | Y | Y | Y | Y | Y | Y | Y | High quality |
Neelamana 2020 [65] | U | Y | Y | Y | Y | N | Y | N | Medium quality |
Pillai 2015 [44] | Y | Y | Y | Y | Y | Y | Y | Y | High quality |
Pushpanjali 2013 [45] | Y | Y | Y | Y | Y | Y | Y | Y | High quality |
Rajagopalachari 2015 [46] | Y | U | Y | Y | Y | Y | Y | Y | High quality |
Rekhi 2015 [77] | U | U | U | Y | U | U | Y | Y | Low quality |
Rekhi 2016 [47] | Y | Y | Y | Y | Y | U | Y | Y | High quality |
Rekhi 2018 [66] | U | Y | Y | Y | Y | U | U | Y | Medium quality |
Sanadhya 2015 [67] | U | Y | Y | Y | Y | Y | Y | U | Medium quality |
Saxena 2018 [48] | Y | Y | Y | Y | Y | Y | Y | Y | High quality |
Sharna 2019 [68] | U | Y | Y | Y | U | U | Y | U | Medium quality |
Shetty 2013 [78] | U | Y | Y | Y | N | N | U | U | Low quality |
Shivakumar 2018 [69] | U | Y | Y | U | Y | U | Y | U | Medium quality |
Shyam 2020 [70] | Y | Y | Y | Y | Y | Y | U | U | Medium quality |
Siluvai 2015 [49] | Y | Y | Y | N | Y | Y | Y | Y | High quality |
Singh 2019 [80] | U | U | U | N | Y | N | N | N | Low quality |
Singh 2020 [79] | U | Y | Y | U | N | N | Y | U | Low quality |
Singh N 2020 [50] | Y | Y | U | Y | Y | Y | Y | Y | High quality |
Sreela 2020 [51] | Y | Y | Y | Y | Y | Y | Y | Y | High quality |
Suguna 2020 [71] | U | U | Y | Y | N | N | Y | Y | Medium quality |
Thetakala 2018 [52] | Y | Y | Y | Y | Y | Y | Y | Y | High quality |
Usha 2012 [53] | Y | Y | Y | Y | Y | Y | Y | Y | High quality |
Vinayagamoorthy 2020 [54] | Y | Y | Y | Y | Y | Y | Y | Y | High quality |
Yadav 2019 [72] | Y | Y | Y | Y | N | N | Y | Y | Medium quality |