The institutions that build these national and international statistics do so with bias and goals, or without complete data. For example, how can a bureau make a national statistics on crime accurate when cities intentional report crime incorrectly to look better in statistics.
To think "cited findings" is gospel truth is naive. I know it's highly desired here, but I stand by what I'm saying. Data is lovely, but garbage in, garbage out, and most national-level data is complete garbage with an agenda or bias or naivety.