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Table 1 Assessment of quality of general population studies and studies toward specific Populations at risk

From: Systematic review and meta-analysis of HIV, HBV and HCV infection prevalence in Sudan

Aspect Score Description
Age 0 Not determined
0 Determined with clear bias; not representative to general/targeted population
1 Determined with no clear bias; can be considered representative
Gender 0 Not determined
0 Determined with clear bias
1 Determined with no clear bias; can be considered representative
Coverage 1 Single centre/local
2 Multi-centre/local
3 Multi-centre/national
Sample sizea 0 Less than 150 participants
1 More than 150 and less than 1000 participants
2 More than 1000 participants
  1. aThresholds were set based on authors opinion solely