Average Change on the PGI-R vs. Age, for the Arizona and National Treatment group. There is a slight, non-significant correlation of the Average Change vs. age, as indicated by the trendline. The y-axis is from -3 (much worse) to 0 (no change) to +1 (slightly better) to +2 (better) to +3 (much better).
Adams et al. BMC Pediatrics 2011 11:111 doi:10.1186/1471-2431-11-111