The development of a glaucoma-specific health-related quality of life item bank supporting a novel computerized adaptive testing system in Asia

Journal of Patient-Reported Outcomes

Table 4 The process of refining the initial item pools to the final pilot instrument (Phase 2)

	VS	OS	AL	DV	LT	MB	PS	GM	WK	Total
Initial pools	18	21	73	18	10	22	108	18	23	311
After domain ranking	18	21	79	–	16	20	69	18	20	261
Binning & winnowing #1	15	19	79	–	16	20	69	16	20	254
Binning & winnowing #2	–	20	77	-	16	20	70	16	13	232
Cognitive interviews	–	19	72	–	15	19	55	28	13	221

VS visual symptoms; OS ocular comfort symptoms; AL activity limitation; DV driving; LT lighting; MB mobility; PS psychosocial; GM glaucoma management; WK work