Given your careful reading of this report I would be curious to hear what you think of the reply from the authors. bsky.app/profile/i4re...

There are a couple of review papers - reporting a tendency for declines in vocab more than in abstract raven IIRC. Some see this as evidence that g is declining - since vocab items have high g loadings - others see it as reflecting societal trends in vocab exposure and schools

Here is data from Norwegian standardised national tests in reading, math and english skills for fifth and eighth grade. Scale should be comparable over time due to anchor design with IRT methodology. Suggests some covid-decline across all subjects (Norway school closures less extreme, though).

Not sure - but suspect Norwegian test score decline largely due to changes in what schools give practice in: the vocabulary test uses word items from early 1950s and the math test tests the kind of pen-and-paper problems later cohorts had less practice with (calculators). "Raven" subtest is stable.

Hadde vært interessant å se seriene over tid for webskjema og telefon separat - der burde jo vært en grei sak for FHI å gi ut