In-essay Quantum Country question difficulties partially predict first review difficulties

QCVC questions which many users forget in-essay tend to be forgotten in the first review session, and vice-versa, though R^2 is only ~0.5.

20220118104242 (using samples of readers who collected 80+ cards and completed a full first review of all of them)

As in In-essay Quantum Country reader performance partially predicts first review performance, the bottom and top quartiles are much more predictive than the middle ones.