Repeating the repeated measures ANOVA without the “What” task did not change the pattern of results (with the possible exception of bringing the Support × Task × Age interaction up to a nonsignificant trend F (2,71) = 2.850, P = 0.064, η 2 = 0.074).
These differences broadly reflect the pattern observed in the three individual content scores, and filter through to the resulting structuring difficulty score: When all participants are considered, structure difficulty shows a highly significant cubic trajectory, with the youngest and oldest participants finding association of elements more difficult than middle adolescent participants.