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Table 7 Item Summary, Internal Consistency Reliability, and Results of Exploratory Factor Analysis for Severity of Illness Rating Scores (SIRS) reflective of Mild (n = 150) and Moderate to Severe (n = 153)

From: Reliability and construct validity of the Participation in Life Activities Scale for children and adolescents with asthma: an instrument evaluation study

    Internal Consistence Reliability Factor Analysis Principal Components
  M SD Item to Total Correlation Scale Alpha & if Item Deleted KMO Sampling Adequacy Rescaled Factor Loading (PC) Rescaled Amount of Variance Explained
SIRS (4–5) PLA 1.989 .740 - .689 .660 - 60.7
   Planning for .542 .349 .50 .598 - .858 -
   Interference with .635 .317 .55 .529 - .811 -
   Prevention from .812 .274 .47 .641 - .654 -
SIRS (6–12) PLA 1.653 .794 - .764 .658 - 68.0
   Planning for .424 .310 .50 .781 - .728 -
   Interference with .541 .315 .68 .589 - .871 -
   Prevention from .688 .338 .62 .663 - .867 -