Table 3.

Comparison of paper-based World Health Organization Quality of Life (WHOQOL) measures and the computer adaptive testing (CAT) simulations of the item banks.

Scale	Domain	Original scale information		Stopping rule	CAT simulation
		Items, n	Reliability, alpha	Reliability-matched SE	Items administered, median	Actual SE
WHOQOL-BREF	Physical	7	0.82	0.42	4	0.42
	Psychological	6	0.81	0.44	4	0.42
	Social	3	0.68	0.55	2	0.5
	Environmental	8	0.8	0.45	3	0.43
WHOQOL-100a	Physical	16	0.86	0.37	7	0.36
	Psychological	20	0.82	0.42	4	0.42
	Social	12	0.73	0.52	2	0.5
	Environmental	32	0.85	0.39	5	0.38

^aIndependence and spirituality domains omitted.