Validation of the Spanish version of the migraine disability assessment questionnaire (MIDAS) in university students with migraine

Table 2 Percentages of variance explained by the factor analysis performed using Principal Components Analysis

Component	Initial eigenvalues			Extraction sums of squared loadings			Rotation sums of squared loadings
Component	Total	% of variance^a	Cumulative %^b	Total	% of variance^a	Cumulative %^b	Total	% of variance^a	Cumulative %^b
1	2.846	56.922	56.922	2.846	56.922	56.922	2.823	56.460	56.460
2	1.571	31.428	88.350	1.571	31.428	88.350	1.595	31.890	88.350
3	0.429	8.585	96.935
4	0.113	2.254	99.188
5	0.041	0.812	100.000

^aPercentage of variance that explains each factor of the questionnaire structure
^bTotal percentage of variance explained jointly by the factors that compose the questionnaire structure

ISSN: 1471-2377