Table 2.

Risk of bias assessment (using the Hoy 2012 tool)

Reference	1. Representation	2. Sampling	3. Random Selection	4. Non-response bias	5. Data Collection	6. Case Definition	7. Reliability Tool	8. Method of data collection	9. Numerators and Denominators	Summary Assessment
Narayan 2019[26]	High	High	High	Unsure	Low	Low	Unsure	Low	High	Moderate
Kumar 2014[27]	Low	Low	Low	Unsure	Low	Low	Low	Low	Low	Low
Kumar 2014[23]	Low	Low	Low	Unsure	Low	Low	Low	Low	Low	Low
Agarwal 2014[25]	Low	High	Low	Unsure	Low	High	Low	Low	Low	Moderate
Sehgal 2015[28]	Low	Low	High	Unsure	Low	Low	Low	Low	Low	Low
Kumar 2019[29]	Low	High	Low	Unsure	Low	High	Low	Low	Low	Moderate
Qureshi 2016[24]	Low	High	Low	Unsure	Low	High	Low	Low	Low	Moderate
Grills 2012[30]	Low	Low	Low	Unsure	Low	High	Low	Low	Low	Low
Upendra 2017[22]	Low	Low	High	Unsure	Low	Low	Low	Low	Low	Low