A. Violin plots of the ISNCSCI upper-limb motor scores (ULMS) and, B. GRASSP strength scores for all participants with spinal cord injury for both the left and right limbs. C. Heatmap of the distribution of ISNCSCI ULMS and GRASSP strength scores, considering the categorized grades of the American Spinal Injury Association Impairment Scale (AIS) A, B, and C for both the left and right limbs. D. Scatter matrix plot with Pearson’s correlation coefficient between ISNCSCI ULMS and GRASSP strength scores for both the left and right limb. ISNCSCI: International Standards for Neurological Classification of Spinal Cord Injury, AIS: American Spinal Injury Association Impairment Scale, GRASSP: Graded Redefined Assessment of Strength, Sensibility, and Prehension, version 1. DEL: anterior deltoid, BIC: biceps brachii, ECR: extensor carpi radialis, TRIC: triceps brachii, ED: extensor digitorum, FDP: flexor digitorum profundus, OP: opponens pollicis, FPL: flexor pollicis longus, ADM: abductor digiti minimi, FDI: first dorsal interosseous.
ISNCSCI: 0 = total paralysis, 1 = palpable or visible contraction, 2 = active movement, full range of motion (ROM) with gravity eliminated, 3 = active movement, full ROM against gravity, 4 = active movement, full ROM against gravity and moderate resistance in a muscle specific position, 5 = (normal) active movement, full ROM against gravity and full resistance in a muscle specific position expected from an otherwise unimpaired person.
GRASSP: 0 = No palpable or visible muscle contraction, 1 = Palpable or visible muscle contraction, 2 = Moves full ROM with gravity eliminated, 3 = Moves full ROM against gravity without added resistance, 4 = Holds position of resistance against moderate resistance, 5 = Holds position of resistance against maximal resistance.