Table 3.

Appropriateness rating CAT vs. QLQ-C30 questions

	Physical Functioning				Emotional Functioning
	CAT	QLQ-C30			CAT	QLQ-C30
Information*	28.76	10.96			12.04	6.83
Median of difference in information	18.59				4.45
Preferences	CAT	indifferent	QLQ-C30		CAT	indifferent	QLQ-C30
Overall	56.8% n = 25	27.2% n = 12	15.9% n = 7	p = 0.002	4.5% n = 2	40.9% n = 18	54.5%n = 24	p < 0.001
Large difference in information group	68.2% n = 15	22.7% n = 5	9.1% n = 2		9.1% n = 2	22.7% n = 5	68.2% n = 15
Small difference in information group	45.5% n = 10	31.8% n = 7	22.7% n = 5		0	59.1% n = 13	40.9% n = 9

Note. * = Mean test information values (i.e. measurement precision) derived from IRT models used for item calibration [9, 10]. Please note that there are no absolute values for test information