a significant trendP = .046
Among both descriptive and binary questions, the median accuracy scores for easy, medium, and hard answers were 6.0 (IQR, 6.0-6.0; mean [SD] score, 5.9 [0.3]), 5.5 (IQR, 3.9-6.0; mean [SD] score, 4.8 [1.7]), and 5.8 (IQR, 5.0-6.0; mean [SD] score, 5.3 [1.1]), respectively, with a significant trend ( P = .046 determined by the Kruskal-Wallis test).