Validity and Reliability of the Bahasa Melayu Version of the Migraine Disability Assessment Questionnaire

Table 4

Correlation coefficients in the Malaysian, Italian, American, and English studies.

Item	Malaysia^1		Italy^2		USA^3		UK^4
	Pearson’s; correlation	Spearman’s; correlation	Pearson’s; correlation	Spearman’s; correlation	Pearson’s; correlation	Spearman’s; correlation	Pearson’s; correlation	Spearman’s; correlation
1	0.92	0.87	0.64	0.74	0.68	0.69	0.66	0.56
2	0.94	0.84	0.77	0.81	0.54	0.65	0.71	0.65
3	0.88	0.77	0.65	0.63	0.60	0.63	0.82	0.58
4	0.83	0.81	0.72	0.64	0.64	0.59	0.60	0.56
5	0.71	0.77	0.54	0.49	0.62	0.71	0.52	0.46
Total	0.91	0.87	0.81	0.77	0.80	0.78	0.83	0.77
A	0.65	0.73	0.61	0.70	NR*	NR*	NR*	NR*
B	0.86	0.89	0.64	0.65	NR*	NR*	NR*	NR*

∗NR: not reported; ¹one hundred migraine patients from clinical studies; ²eighty-six migraine without aura patients from clinical series; ³ninety-seven migraine patients from the general population; ⁴one hundred migraine patients from the general population.