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Table 1 Reliability test of OIDP among the validation sample (n:253).

From: Validation of two complementary oral-health related quality of life indicators (OIDP and OSS 0-10 ) in two qualitatively distinct samples of the Spanish population

OIDP Dimensions Corrected item-total correlation Alpha if item deleted
Eating 0.46 0.77
Speaking 0.57 0.75
Cleaning 0.38 0.78
Working 0.36 0.78
Social 0.57 0.75
Sleeping & Relaxing 0.47 0.77
Smiling 0.53 0.75
Emotional 0.68 0.73
  1. Analysis of corrected item-total correlation and Alpha value if item deleted.
  2. Alpha = 0.78
  3. Standardised item Alpha = 0.79