Power calculations based on study with a similar target group using the instrument Canadian Occupational Performance Measure, estimate a need for only 21 participants in each group due to the longitudinal design. However, in order to account for possibilities of frailer target group or a large drop out rate (40 %), a total number of 30 participants in each group will be tried recruited. Data analyses will be performed according to intention to treat. The working hour data is panel data and will be analyzed accordingly; a random or a mixed effect regression model will be employed. Also, descriptive statistics and simpler tests will be carried out.