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Table 6 Internal consistency reliability: Cronbach's alpha, Alpha if item deleted and Corrected item-total correlation (TMD groups)

From: Evaluating oral health-related quality of life measure for children and preadolescents with temporomandibular disorder

TMD groups   Number of items Cronbach's alpha Range of α's if items deleted Range of corrected item total correlations
CPQ8-10 Total scale 25 0.93 (0.93-0.93) (0.39-0.76)
n = 141 Subscales     
     Oral symptoms 5 0.68 (0.61-0.66) (0.37-0.48)
     Functional limitations 5 0.78 (0.70-0.75) (0.51-0.67)
     Emotional well-being 5 0.85 (0.81-0.83) (0.60-0.71)
     Social well-being 10 0.90 (0.88-0.90) (0.52-0.77)
CPQ11-14 Total scale 37 0.94 (0.93-0.94) (0.28-0.73)
n = 176 Subscales     
     Oral symptoms 6 0.69 (0.62-0.68) (0.33-0.51)
     Functional limitations 9 0.79 (0.76-0.78) (0.40-0.57)
     Emotional well-being 9 0.90 (0.88-0.89) (0.59-0.76)
     Social well-being 13 0.87 (0.85-0.87) (0.28-0.67)
  1. TMD, temporomandibular disorder; CPQ, child perceptions questionnaire