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. 2009 Apr 22;9:11. doi: 10.1186/1472-6831-9-11

Table 4.

The internal consistency and inter-item correlation for CPQ8–10 and CPQ11–14 and their subdomains

Chronbach's α Average inter-item correlations
CPQ8–10 CPQ11–14 CPQ8–10 CPQ11–14
Overall score 0.82 0.87 0.15 0.16
 Oral symptoms 0.57 0.49 0.21 0.14
 Functional limitations 0.78 0.69 0.37 0.20
 Emotional well-being 0.76 0.85 0.34 0.40
 Social well-being 0.69 0.68 0.17 0.14