“…To be included in the meta‐analysis for the knowledge category (parent scores only), the authors had to report outcomes specifically related to diabetes knowledge (general, treatment, or care). When more than one intervention group was compared with control [9,19–21], we chose the intervention theoretically most effective. We stratified studies a priori by follow‐up interval: < 3 months, 6–12 months [22], or > 12 months.…”