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Table 2 Comparison of reviews based on responders and non-responders of questionnaire

From: The prevalence of and factors associated with inclusion of non-English language studies in Campbell systematic reviews: a survey and meta-epidemiological study

  Response from review author (n = 47) No response from review author (n = 76)
Publication year 2013 2012
Author numbers 4 4
Language criteriaa 1 1
Number of searched sources 23 21
Number of included studies 13 17
  1. All figures are reported as medians
  2. aFor the language criteria variable, the value of 1 equals language openness, while the value of 0 equals the explicit restriction to English publications (LOE-restricted)