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Table 6 Floor and ceiling effects of the Patient Enablement Instrument for Back pain based on 261 participants with non-specific low back pain

From: The patient enablement instrument for back pain: reliability, content validity, construct validity and responsiveness

  Scale range Classical method Scale width method
Floor effect (%) Ceiling effect (%) Floor effect (%) Ceiling effect (%)
PEI-BP sum score 0–60 0.0 2.7 0 29.9