Tag: MCID

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Using the Quality Outcomes Database to Identify Minimum Clinically Important Differences for Patients With Cervical Spondylotic Myelopathy

Neurosurgery 98:1347–1358, 2026

This multicenter retrospective analysis of 1,141 surgical cases from the Quality Outcomes Database defines optimal minimum clinically important differences (MCIDs) for commonly used patient-reported outcome measures (PROMs) in cervical spondylotic myelopathy (CSM). The study compares several MCID calculation methods using AUCs anchored to patient satisfaction at 3- and 24-month follow-ups to identify the most predictive thresholds.

Key findings report a ≥30% improvement from baseline as the preferred MCID for NDI and neck/arm NRS, severity-adjusted point increases for mJOA, and absolute numeric cutoffs for EQ-5D (0.065 at 3 months; 0.149 at 24 months). Achievement rates and implications for clinical decision-making and benchmarking across centers are provided.

Aim Identify the most appropriate MCID thresholds for common PROMs in surgical cervical spondylotic myelopathy (CSM) using the Quality Outcomes Database (QOD) cohort.

Cohort Analyze 1141 CSM surgical cases across 14 sites (enrolled 2016–2018) with a 24-month follow-up rate of 87.6% (excluding 2.5% deaths).

PROMs Use baseline, 3-month, and 24-month outcomes for NDI, EQ-5D (QALYs), mJOA, and neck/arm pain NRS, with patient satisfaction as the anchor.

Anchor/AUC method Define “satisfied” using the NASS satisfaction scale (responses 1–2) vs “not satisfied” (3–4), then compare MCID methods by AUC for predicting satisfaction.

NDI & pain MCID A ≥30% improvement from baseline is the preferred/optimal MCID benchmark for NDI and neck/arm pain NRS (close to the best-performing ROC-derived percentage cutoffs).

EQ-5D MCID Absolute numeric cutoffs outperform other methods for EQ-5D: +0.065 QALYs (3 months) and +0.149 QALYs (24 months).

mJOA MCID A severity-adjusted approach performs best for mJOA: improvement of ≥1 (mild), ≥2 (moderate), or ≥3 (severe) points.

MCID achievement (24 months) MCIDs are achieved by 63% (NDI), 59% (neck pain NRS), 61% (arm pain NRS), 52% (EQ-5D), and 59% (mJOA) of patients.

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Minimal Clinically Important Difference and Relative Change in Patient-Reported Outcomes After Surgery for Cervical Spondylotic Myelopathy: A Nationwide Study of 1,700 Patients

Neurosurgery 98:358–364, 2026

This nationwide registry study of 1,756 patients evaluates minimal clinically important difference (MCID) versus minimal clinically important relative change (MCIRC) for patient-reported outcomes after surgery for degenerative cervical myelopathy. Using anchor-based ROC analyses, the authors derive MCID and MCIRC thresholds for NRS neck/arm pain, EQ-5D index, EQ VAS, and NDI, and compare predictive accuracy for patient satisfaction at one year.

Key findings show MCIRC outperforms absolute MCID for NRS neck and arm pain and NDI, while MCID is superior for EQ-5D index and EQ VAS; selected thresholds are reported (e.g., NRS neck MCID −3 and MCIRC −47%). The study recommends incorporating MCIRC in future spine outcome guidelines to improve individualized assessment.

Minimal Clinically Important Difference (MCID): MCID represents the smallest absolute change in patient-reported outcome measures (PROMs) that signifies meaningful improvement for the patient after cervical spondylotic myelopathy surgery.

Minimal Clinically Important Relative Change (MCIRC): MCIRC is a proportional measure that reflects the minimum relative change in PROMs from baseline, making it more sensitive to changes in patients with extreme baseline values.

Calculation Methods: MCID and MCIRC values were determined using anchor-based approaches (with patient satisfaction as the anchor), ROC curve analysis with the Youden index, minimal detectable change (MDC), and mean change methods.

Key Thresholds Identified: MCID values were −3 for NRS neck pain, −2 for NRS arm pain, 0.09 for EQ5D index, 7 for EQ VAS, and −12 for NDI; MCIRC values were −47% for NRS neck pain, −40% for NRS arm pain, 386% for EQ5D index, 52% for EQ VAS, and −32% for NDI.

Predictive Accuracy: Relative change (MCIRC) provided greater predictive accuracy for identifying patient satisfaction in NRS neck/arm pain and NDI, while absolute difference (MCID) was superior for EQ5D index and EQ VAS.

Clinical Implication: MCIRC is recommended for PROMs influenced by baseline severity (like pain and disability scores), as it better accounts for individual variability and may enhance individualized patient assessment.

Study Population: The study analyzed 1,756 patients from the Swedish Spine Registry who underwent surgery for degenerative cervical myelopathy, with 59% reporting satisfaction at one year postoperatively.

Practical Recommendation: Incorporating MCIRC thresholds into future spine surgery outcome guidelines could improve evaluation of individualized patient recovery.

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