A Cascade chart, particularly in the context of NDI (Neck Disability Index) interval reliability, is a visual representation used to display the reliability of a measurement tool, such as the NDI. The NDI is a questionnaire that assesses how neck pain affects a person's ability to manage everyday activities. **Key Points about Cascade Charts and NDI Interval Reliability:** 1. **Measurement Reliability**: Interval reliability refers to the consistency of a measure across different occasions.
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