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Table 2 Counts of comprehension tasks by category of comprehension rate achieved, respondent status and educational attainment, for the 39 comprehension tasks included in the questionnaire

From: Communicating population health statistics through graphs: a randomised controlled trial of graph design interventions

  All respondents Non university-qualified University-qualified
Comprehension rate Intervention (No. of tasks) Control (No. of tasks) Intervention (No. of tasks) Control (No. of tasks) Intervention (No. of tasks) Control (No. of tasks)
Very low (0% to <20%) 0 1 0 3 0 2
Low (20% to <40%) 1 4 2 7 1 1
Moderate (40% to <60%) 3 9 3 6 1 7
High (60% to <80%) 7 8 13 10 6 11
Very high (above 80%) 28 17 21 13 31 18