Fig. 2.

a Pearson correlation representing the association between advancing age and severity of shoulder and arm pain. The severity of shoulder and arm pain was positively correlated with advancing age (r = 0.41, 95% CI 0.18–0.59, P = 0.0007). b Comparative analysis of shoulder and arm pain with box plots representing patients aged <65 and ≥65 years. Patients >65 years had a poorer outcome and higher mean pain score (35.10 ± 28.20) than patients <65 years (12.86 ± 16.00)