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Pilot study to determine the practicality and inter-rater reliability of the “Core Score,” a composite measure of 4 clinical core stability tests.Repeated measures.Academic hospital physician clinic.23 healthy volunteers with mean age of 32 years (12 females, 11 males).All subjects performed 4 core stability maneuvers under direct observation from 3 independent physicians in sequence.Inter-rater reliability and time necessary to perform examination.The Core Score scale is 0 to 12, with 12 reflecting the best core stability. The mean composite score of all 4 tests for all subjects was 9.54 (SD, 1.897; range, 4-12). The intraclass correlation coefficients (ICC 1,1) for inter-rater reliability for the composite Core Score and 4 individual tests were 0.68 (Core Score), 0.14 (single-leg squat), 0.40 (supine bridge), 0.69 (side bridge), and 0.46 (prone bridge). The time required for a single examiner to assess a given subject's core stability in all 4 maneuvers averaged 4 minutes (range, 2-6 minutes).Even without specialized equipment, a clinically practical and moderately reliable measure of core stability may be possible. Further research is necessary to optimize this measure for clinical application.Despite the known value of core stability to athletes and patients with low back pain, there is currently no reliable and practical means for rating core stability in a typical office-based practice. This pilot study provides a starting point for future reliability research on clinical core stability assessments.