Table 6

Dyspepsia specific health related quality of life (HRQOL) instruments

			Validity
Instrument	Items/scoring^6-150	Domains	Face	Content	Construct	IC	TR
QPD38	30/NS	Anxiety, social, symptom perception	L, E, P	2 field tests	SF-36	0.73–0.91	NT
FDDQL39	43/0–100	Activities, anxiety, diet, sleep, discomfort, coping, control, stress	L, E, P	3 field tests	SF-36	0.69–0.89	0.98
QOLRAD32	25/25–175	Emotional, sleep, eating problems, physical/social, vitality	L, E, P	Factor analysis	SF-36, GSRS	0.89–0.94	NT
QLDUP40	54/NS	SF-36 + PGWBI, family circle, food, drink, coffee-tobacco, pain	E, P	NT	NT	>0.70	0.73
Not named42	8/40–8	NS	L, E	1 field test	NT	NT	0.69–0.82

↵6-150 Scores range from worst to best QOL.
NS, not stated; NT, not tested; IC, internal consistency (Cronbach's alpha); TR, test-retest.
L, literature review; E, expert opinion; P, patient interviews.