Skip to main content

Table 2 Assessment of unidimensionality using PCA and the resulting theoretical and statistical food literacy components

From: Development, validation and item reduction of a food literacy questionnaire (IFLQ-19) with Australian adults

Theoretical domains, components and statistical components of food literacy KMOa Bartlett’s test Total Variance Explained
Chi-square df p-valueb Total % variance explained
Domain 1
1.1
  1.1.1 0.85 0916.83 10  < 0.001 3.03 61
  1.1.2 0.65 0221.15 6  < 0.001 1.84 47
1.2 0.63 0423.23 6  < 0.001 2.09 52
1.3
  1.3.1 0.83 1095.28 10  < 0.001 3.14 63
  1.3.2 0.79 0650.99 6  < 0.001 2.56 64
  1.3.3 0.75 0527.09 10  < 0.001 2.45 49
Domain 2
2.1 0.85 1140.37 15  < 0.001 3.43 57
2.2
  2.2.1 0.77 0635.45 10  < 0.001 2.64 53
  2.2.2 0.86 1040.18 21  < 0.001 3.41 49
2.3 0.73 0612.55 3  < 0.001 2.28 76
Domain 3
3.1 0.92 1830.14 28  < 0.001 4.59 57
3.2
3.2.1 0.81 1044.70 15  < 0.001 3.21 54
3.2.2 0.63 0264.51 3  < 0.001 1.85 62
Domain 4
4.1
  4.1.1 0.87 0974.10 15  < 0.001 3.26 54
  4.1.2 0.53 0442.94 3  < 0.001 1.84 61
4.2
  4.2.1 0.95 3327.67 55  < 0.001 6.47 59
  4.2.2 0.85 1011.36 10  < 0.001 3.15 63
  4.2.3 0.67 0534.12 3  < 0.001 2.16 72
4.3 0.84 1046.45 21  < 0.001 3.38 48
  1. aKMO > 0.5 = sampling adequacy
  2. bp-value < 0.05 = suitability of data for PCA