Can we screen young children for their ability to provide accurate self-reports of pain?

No validated screening tasks exist to distinguish children who can accurately use self-report pain measures from those who cannot. Children aged 3-7 years (n=108), each with a parent, provided data before and after day surgery. Parents rated how well they thought their child could understand the Faces Pain Scale-Revised (FPS-R), and children completed 4 screening tasks in counterbalanced order, such as rating pain in vignettes and selecting a middle-sized cup. Parents and children used the FPS-R to rate the children's pain intensity. Children's FPS-R ratings were scored for accuracy based on the extent to which they conformed to expected pain trajectories (e.g., pain increasing following surgery, decreasing following analgesia), and based on parent-child agreement. On average, parents rated the youngest age at which children could understand the FPS-R as 4.4 years (95% confidence interval 4.1-4.5). The youngest children provided inaccurate high pain ratings before surgery, but they became indistinguishable from the oldest in the accuracy of their pain ratings for the remainder of the 3-day study period, suggesting that direct experience with pain or with the rating task may improve accuracy. Although children's performance on the screening tasks was significantly associated with self-report accuracy, no prediction was strong enough for clinical use (all r's < 0.30). We failed to identify a screening tool that was better than chronological age in identifying which children could accurately self-report pain using the FPS-R. Future research should explore other screening tasks, training methods, and simplified approaches to pain assessment for young children. The ability to use self-report pain scales usually develops from age 3 to 7 years, but no valid screening method exists to identify this achievement.