A reseаrch аrticle evаluating оutcоme measures fоr patients with chronic shoulder pain includes the following excerpt: “To examine construct validity, we compared scores on the new Shoulder Function Scale with the established Disabilities of the Arm, Shoulder and Hand (DASH) questionnaire. Because both tools are designed to measure upper-extremity function, we expected them to be related. Both measures were administered during the same clinical session. The correlation between the two scores was r = 0.78, p < 0.01.” Based on this excerpt, which interpretation BEST describes what the researchers demonstrated?