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Self-administered questionnaires, such as the Patient Health Questionnaire (PHQ-9), are regularly used in clinical practice to guide prescribing or to measure recovery and response to treatment. There are concerns that patients are not all interpreting the questionnaire items in the same way. Cognitive interviewing is a research technique that identifies 'interpretative measurement error' (IME). IME is distinct from traditional components of measurement error, such as not reading the question as worded, or recording answers inaccurately.

Usefulness of PHQ-9 in primary care to determine meaningful symptoms of low mood: a qualitative study