To evaluate the construct validity and the inter-rater reliability of the Dutch Activity Measure for Post-
Acute Care “6-clicks” Basic Mobility short form measuring the patient’s mobility in Dutch hospital care.
First, the “6-clicks” was translated by using a forward-backward translation protocol. Next, 64 patients
were assessed by the physiotherapist to determine the validity while being admitted to the Internal
Medicine wards of a university medical center. Six hypotheses were tested regarding the construct
“mobility” which showed that: Better “6-clicks” scores were related to less restrictive pre-admission living
situations (p¼0.011), less restrictive discharge locations (p¼0.001), more independence in activities of
daily living (p¼0.001) and less physiotherapy visits (p<0.001). A correlation was found between the
“6-clicks” and length of stay (r¼ 0.408, p¼0.001), but not between the “6-clicks” and age (r¼ 0.180,
p¼0.528). To determine the inter-rater reliability, an additional 50 patients were assessed by pairs of
physiotherapists who independently scored the patients. Intraclass Correlation Coefficients of 0.920
(95%CI: 0.828–0.964) were found. The Kappa Coefficients for the individual items ranged from 0.649 (walking
stairs) to 0.841 (sit-to-stand). The Dutch “6-clicks” shows a good construct validity and moderate-toexcellent
inter-rater reliability when used to assess the mobility of hospitalized patients.