Using pictures to convey health information: A systematic review and meta-analysis of the effects on patient and consumer health behaviors and outcomes.

Abstract

Assess the effect of pictorial health information on patients' and consumers' health behaviors and outcomes, evaluate these effects in lower health literacy populations, and examine the attributes of the interventions. We included randomized controlled trials (RCTs) that assessed the effect of pictorial health information on patient and consumer health behaviors and outcomes. We conducted a meta-analysis of RCTs that assessed knowledge/understanding, recall, or adherence, and a subgroup analysis of those outcomes on lower health literacy populations. We narratively reviewed characteristics of pictorial health interventions that significantly improved outcomes for lower health literacy populations. From 4160 records, we included 54 RCTs (42 in meta-analysis). Pictorial health information moderately improved knowledge/understanding and recall overall, but largely increased knowledge/understanding for lower health literacy populations (n = 13), all with substantial heterogeneity. Icons with few words may be most helpful in conveying health information. Our results support including pictures in health communication to improve patient knowledge. Our results should be interpreted with caution considering the significant heterogeneity of the meta-analysis outcomes. Future research should assess which types and characteristics of pictures that best convey health information and are most useful and the implementation and sustainability in healthcare contexts. PROSPERO CRD42018084743.