Catquest-9SF questionnaire: validation of Malay and Chinese-language versions using Rasch analysis

Adnan, Tassha Hilda; Mohamed Apandi, Mokhlisoh; Kamaruddin, Haireen; Salowi, Mohamad Aziz; Law, Kian Boon; Haniff, Jamaiyah; Goh, Pik Pin

doi:10.1186/s12955-017-0833-3

Health and Quality of Life Outcomes

Table 5 Differential item functioning (DIF) by age, gender and visual acuity

From: Catquest-9SF questionnaire: validation of Malay and Chinese-language versions using Rasch analysis

Version	Item	DIF by age				DIF by gender				DIF by VA
		Item difficulty		Diff in logits	P-value^a	Item difficulty		Diff in logits	P-value^a	Item difficulty		Diff in logits	P-value^a
		≤65 years	>65 years	Diff in logits	P-value^a	Male	Female	Diff in logits	P-value^a	VA >6/18	VA ≤6/18	Diff in logits	P-value^a
Malay	n=	141	94			107	129			76	108
	Daily-life activities in general	−0.16	−0.20	0.04	0.866	−0.16	−0.16	0.00	>0.995	−0.49	0.01	−0.51	0.043
	Satisfaction with vision	−0.88	−0.66	−0.22	0.341	−0.77	−0.77	0.00	>0.995	−0.71	−0.87	0.16	0.515
	Reading newspaper	−0.77	−0.88	0.11	0.649	−0.98	−0.67	−0.31	0.181	−0.77	−0.84	0.17	0.778
	Recognizing faces	0.86	0.78	0.08	0.724	0.90	0.77	0.13	0.561	1.13	0.55	0.58	0.029
	Seeing prices when shopping	−0.27	−0.43	0.16	0.486	−0.43	−0.27	−0.15	0.498	−0.46	−0.34	−0.12	0.626
	Walk on uneven ground	0.34	0.39	−0.05	0.815	0.53	0.18	0.35	0.118	0.45	0.22	0.23	0.369
	Needlework and handicraft	0.06	0.03	0.02	0.916	0.03	0.03	0.00	>0.995	0.07	0.23	−0.16	0.551
	Reading text on TV	−0.01	0.20	−0.20	0.382	−0.03	0.15	−0.18	0.432	0.11	0.21	−0.10	0.685
	Hobbies	0.85	0.78	0.07	0.772	0.87	0.78	0.08	0.712	0.72	0.82	−0.10	0.717
Chinese	n=	70	131			93	109			79	96
	Daily-life activities in general	−0.01	0.28	−0.29	0.299	0.36	0.04	0.32	0.230	−0.03	0.24	−0.26	0.360
	Satisfaction with vision	−2.19	−1.98	−0.21	0.465	−2.16	−1.95	−0.21	0.443	−2.12	−2.05	−0.07	0.809
	Reading newspaper	−0.73	−0.64	−0.09	0.748	−0.54	−0.77	0.23	0.377	−0.66	−0.61	−0.05	0.856
	Recognizing faces	1.30	1.13	0.17	0.568	0.92	1.40	−0.48	0.086	1.44	1.02	0.42	0.163
	Seeing prices when shopping	−0.71	−0.67	−0.04	0.895	−0.79	−0.56	−0.23	0.384	−0.57	−0.67	0.10	0.724
	Walk on uneven ground	1.12	1.12	0.00	>0.995	1.17	1.09	0.08	0.760	0.98	1.21	−0.23	0.439
	Needlework and handicraft	0.14	0.11	0.03	0.927	0.25	−0.01	0.26	0.345	0.04	0.28	−0.24	0.419
	Reading text on TV	0.21	−0.12	0.32	0.259	−0.01	−0.01	0.00	>0.995	0.17	−0.13	0.30	0.300
	Hobbies	0.89	0.75	0.14	0.635	0.81	0.79	0.02	0.942	0.79	0.71	0.08	0.793

^aWelch’s test

Back to article page

ISSN: 1477-7525

Contact us

Submission enquiries: journalsubmissions@springernature.com