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PCA and EFA
| Scale | Item | Factor (n) | Variance (%) |
|---|---|---|---|
| SRI-RC | 8 | 2 | 56.70 |
| SRI-PF | 6 | 1 | 57.86 |
| SRI-AS | 7 | 2 | 61.35 |
| SRI-SR | 6 | 2 | 77.00 |
| SRI-AX | 5 | 2 | 70.61 |
| SRI-WB | 9 | 3 | 75.23 |
| SRI-SF | 8 | 2 | 66.17 |
Abbreviations: PCA, principal component analysis; EFA, exploratory factor analysis; SRI, Severe Respiratory Insufficiency Questionnaire; RC, respiratory complaints; PF, physical functioning; AS, attendant symptoms and sleep; SR, social relationships; AX, anxiety; WB, psychological well-being; SF, social functioning.
