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Table 2 Score distributions, internal consistency, and missing responses on the CQ7: overall sample and patient and control groups (baseline visit).

From: Measuring outcomes in allergic rhinitis: psychometric characteristics of a Spanish version of the congestion quantifier seven-item test (CQ7)

  CQ7: overall sample CQ7: Patients CQ7: Controls
  (n = 201) (n = 166) (n = 35)
Missing responses*, n 0 0 0
Theoretical score range 0 - 28 0 - 28 0 - 28
Observed score range 0 - 25 0 - 25 0 - 16
Mean (SD) score on CQ7 14.5 (5.6) 15.9 (5.2) 3.6 (4.3)
Cronbach's alpha 0.92 0.86 0.89
Ceiling effect (%) a 1.0 1.2 2.9
Floor effect (%) b 7.0 0.6 37.1
  1. *Number and proportion of respondents with at least one missing response on the CQ7
  2. a% of respondents with the highest (worst) possible score on the CQ7
  3. b% of respondents with the lowest (best) possible score on the CQ7