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Table 4 Overview of sampling stage and contribution to findings for primary studies included in the Qualitative Evidence Synthesis

From: Purposive sampling in a qualitative evidence synthesis: a worked example from a synthesis on parental perceptions of vaccination communication

Sampling step Number of studies that were sampled Average and range of number of findings that these studies contributed to
1- LMIC settings 9 6 (2–13)
2– Score of three or more for data richness 24 13 (3–20)
3– Closeness to the synthesis objectives 5 13 (6–22)