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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