Of the 31 OECD member countries at that date, only 24 had sufficient data to be included in the final comparison (Figs. The criterion for inclusion was the availability of suitable and comparable data for at least 2 out of the 3 indicators used to measure inequality in each dimension of child well-being. Indicators and dimensions The report assesses how far the most disadvantaged children are allowed to fall below national norms in each individual country (represented by the median value).