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Table 3 Exploratory factor analysis factor loadings for one factor, two correlated factors, and bifactor model

From: Unpacking the impact of chronic pain as measured by the impact stratification score

  1 factor 2 factors Bifactor
Item # 𝜆 PII-𝜆 PF-𝜆 Gen—𝜆 PII—𝜆 PF -𝜆
1. Chores 0.70 - 0.52 0.64 - 0.30
2. Stairs 0.67 - 0.77 0.65 - 0.44
3. Walk15 0.67 - 0.89 0.67 - 0.50
4. Errands 0.75 - 0.80 0.72 - 0.45
5. Interfere daily 0.83 0.93 - 0.72 0.53 -
6. Interfere home 0.89 0.97 - 0.77 0.55 -
7. Interfere social 0.80 0.74 - 0.69 0.42 -
8. Interfere chores 0.87 0.82 - 0.75 0.46 -
9. Pain intensity 0.68 0.73 - 0.58 0.41 -
  1. Factor loadings are denoted (𝜆)
  2. Gen =General factor (i.e., impact), PII =Pain interference/intensity factor, PF =Physical function factor. EFA models estimated using minimum residual extraction with an oblimin rotation. Cross-loading values (< .20) are denoted (-) for ease of interpretation