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. Author manuscript; available in PMC: 2016 May 1.
Published in final edited form as: Int Forum Allergy Rhinol. 2015 Feb 17;5(5):399–407. doi: 10.1002/alr.21496

TABLE 1.

Variable reduction in PROMS

Sinonasal Outcomes Test 22 (SNOT-22)

  • Factor 1 (fatigue): Questions 1, 2, 4, 6, 10 explained 39.3% variance

  • Factor 2 (drainage/emotional): Questions 3, 5, 7, 9 explained 11.1% variance

  • Factor 3 (ear/smell/congestion): Questions 8, 11, 12 explained 6.8% variance

Rhinosinusitis Disability Index (RSDI)

  • Factor 1: Emotional questions 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 explained 49.8% variance

  • Factor 2: Physical question 11 and function questions 1, 2, 3, 4, 5, 6, 7, 8, 9 explained 6.5% variance

  • Factor 3: Physical questions 1, 2, 3, 4, 5, 10 explained 5.6% variance

  • Factor 4: Physical questions 6, 7, 8, 9 explained 4.0% variance

12-Item Short Form Health Survey (SF-12)

  • Factor 1: Questions 1, 2, 3, 4, 5, 8, 10 explained 46.7% variance

  • Factor 2: Questions 6, 7, 9, 11, 12 explained 12.2% variance

Factor analysis was done in order to identify correlated variables, allowing reduction into a smaller number of factors to be utilized in the cluster analysis.