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Table 2 Included studies by study type, coded by main methods used

From: School-based vaccination programmes: a systematic review of the evidence on organisation and delivery in high income countries

Study type Examples of methods used Number of studies
I Reviews/synthesis of studies Systematic review, narrative review 3
II Quantitative Cohort analysis, cross-sectional survey, economic evaluation 7
III Qualitative Focus groups, semi-structured interviews, observations 15
IV Descriptive Descriptions of programme experiences, local evaluations 16
V Non-research Expert opinion/conference paper 3
  TOTAL 44