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

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

ComponentInitial eigenvaluesExtraction sums of squared loadingsRotation sums of squared loadings
Total% of varianceaCumulative %bTotal% of varianceaCumulative %bTotal% of varianceaCumulative %b
12.84656.92256.9222.84656.92256.9222.82356.46056.460
21.57131.42888.3501.57131.42888.3501.59531.89088.350
30.4298.58596.935  
40.1132.25499.188
50.0410.812100.000
  1. aPercentage of variance that explains each factor of the questionnaire structure
  2. bTotal percentage of variance explained jointly by the factors that compose the questionnaire structure