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Table 1 Levels of Generality-Specificity of PRO Items and Scales

From: A new measure of patient satisfaction with ocular hypotensive medications: The Treatment Satisfaction Survey for Intraocular Pressure (TSS-IOP)

Levels of PRO Item and Scale Specificity Content Specificity & Referential Certainty Respondents' Inference or Interpretation of Meaning Normative Index of Personal Relevance
Global: Level 1 None High High
General: Level 2 Domain Specific Only Moderate Moderate
Specific: Level 3 Domain & Event Specific Low Low