Construct validity of the instrument DOA: A dialogue about ability related to work

This study examined the construct validity of the newly developed instrument A Dialogue About Ability Related To Work (DOA). DOA [18] was developed using concepts from the Model of Human Occupation [20] as theoretical framework. The instrument assumes the assessment of work ability by both the client and the occupational therapist, and is followed by a dialogue which is expected to distinguish possible goal-setting for further rehabilitation [18,19]. Twenty-one professionals and 126 clients from three clinics in Sweden participated in the study. All clients were involved as outpatients in psychiatric work rehabilitation in county councils or community services. Results of a Rasch analysis test indicated that items are well separated and generally work together in five unidimensional continuums to measure work ability. Twenty-nine of 34 items showed goodness-of-fit statistics, which means acceptable infit MnSq values from > or = 0.6 to < or = 1.4 in association with Z values from -2 to 2. The five misfit items have to be revised. The study has indicated that DOA is a valid instrument in psychiatric work rehabilitation and ought to be useful in the dialogue between occupational therapists and clients about goalsetting and treatment planning.