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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