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Table 1 Quality assessment of included studies

From: Provision of injectable contraceptives by community health workers in sub-Saharan Africa: a systematic review of safety, acceptability and effectiveness

Reference, country

Overall quality assessments

Components of quality assessment

Selection biasa

Study Design

Confoundingb

Blinding

Data collection methodc

Withdrawals and drop-outs

Weidert et al. [10] Ethiopia

Moderate

Strong

Strong

Weak

Weak

Moderate

NA

Okegbe et al. [4] Republic of Benin

Moderate

Strong

Strong

Weak

Weak

Moderate

NA

Mwembo et al. [14] Democratic Republic of Congo

Moderate

Moderate

Strong

Weak

Weak

Moderate

Moderate

Comfort et al. [17] Madagascar

Weak

Weak

Moderate

Weak

Weak

Moderate

NA

Prata et al. [21] Ethiopia

Weak

Weak

Strong

Weak

Weak

Moderate

Moderate

Stanback et al. [19] Uganda

Weak

Weak

Strong

Strong

Weak

Moderate

Strong

Krueger et al. [25] Uganda

Weak

Weak

Moderate

Weak

Weak

Strong

NA

Hoke et al. [18] Madagascar

Weak

Strong

Moderate

Weak

Weak

Moderate

NA

Jacinto et al. [22] Mozambique

Weak

Strong

Strong

Weak

Weak

Moderate

Strong

Chin-quee et al. [15] Zambia

Weak

Strong

Moderate

Weak

Weak

Moderate

NA

Olawo et al. [23] Kenya

Weak

Weak

Moderate

Weak

Weak

Strong

Strong

FHI-USAID [24] Senegal

Weak

Strong

Moderate

Weak

Weak

Strong

Strong

Poss et al. [20] Uganda

Weak

Weak

Moderate

Strong

Weak

Moderate

Weak

  1. aFor observational studies, likelihood of bias was rated based on how likely the participants can be representative of the target population or for non-RCT rated as ‘very likely’ to be representative of target population if not referred from a source and not self-referred
  2. bAssessment of confounders was based on how far authors went to control confounding by design or in their analyses
  3. cData collection method rated as strong if from medical records and moderate or weak if from self-reported data or assessment/screening by researchers Guidance taken from EPHPP Quality Assessment Tool for Quantitative Studies Dictionary