Table 1.

Percent accuracy and statistical significance for target vs. decoy ratings listed by medium.

	Accuracy	Accuracy	Accuracy	Surrogate	Wilcoxon
	target (%)	decoy (%)	difference (%)	(p)	(p)
M1	55.5	41.3	+14.2	0.008	0.029
M2	44.9	41.8	+3.1	ns	0.004
M5	63.3	16.5	+46.8	<0.00005	0.00005
M6	45.1	39.5	+5.6	ns	ns

It should be noted that absolute accuracy values for target and decoy ratings are subjective and depend on the judgment of the sitters. Some sitters may give generally higher scores to all items and some may give generally lower scores to all items. Calculating the differences between decoy and target reading scores (“Accuracy difference” column), rather than examining absolute target accuracy scores, addresses this bias.