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Table 2 Results from factor analysis using horn’s parallel analysis

From: Validation of the Questionnaire to Identify Knee Symptoms (QuIKS) using Rasch analysis

Factor Empirical eigenvalue (95 % CI) Randomly generated eigenvalue Percent variance explained by empirical eigenvalue
1a 5.97 (5.02, 6.92) 1.67 45.9
2 1.35 (1.13, 1.57) 1.49 10.4
3 1.22 (1.03, 1.41) 1.36 9.3
4 1.12 (0.94, 1.30) 1.26 8.6
5 0.69 (0.58, 0.80) 1.18 5.2
  1. 95 % CI means 95 % confidence interval
  2. aOnly factor suitable for extraction from the QuIKS