Table 1: Baseline characteristics and CSA of the ulnar nerve at the elbow in the patients and controls.

VariablePatientsControlsP value

Age (years) 4 8 . 6 ± 1 3 . 5 4 2 . 1 ± 1 2 . 9 0.62
Gender (male : female)16 : 915 : 80.85
Number of patients/examined elbows25/2923/35
Side affected: 𝑛 (%)NA
 Right10 (40%)
 Left11 (44%)
 Bilateral4 (16%)
UNE severity: n (%)NA
 Mild13 (44.8%)
 Moderate8 (27.6%)
 Severe8 (27.6%)
CSA-prox (mm2)6 (5–7)4 (4-5)<0.001
CSA-epi (mm2)7 (5–12)4 (3–5)<0.001
CSA-dist (mm2)5 (4–7)4 (3–5)<0.001
CSA-max (mm2)9 (6.6–13.5)5 (4–6)<0.001

UNE: ulnar neuropathy at the elbow; CSA: cross-sectional area; prox: proximal; epi: epicondyle; dist: distal; max: maximum; NA: not available.