Estimates of effect of health on employment differ from study to study due to differences in methods, data, institutional background and health measure. We assess the importance of these differences, using a unified framework to interpret and contrast estimate for the US and England. We find that subjective and objective health measures, and subjective measures instrumented by objective measure...

We consider nonlinear event systems with quantized state information and design a globally stabilizing controller from which only the minimal required number of control value changes along the feedback trajectory to a given initial condition is transmitted to the plant. In addition, we present a non-optimal heuristic approach which might reduce the number of control value changes and requires a...

PURPOSE The purpose of this study is to psychometrically test the Evaluation of Daily Activity Questionnaire in seven musculoskeletal conditions. MATERIALS AND METHODS One thousand and two hundred people with ankylosing spondylitis; osteoarthritis; systemic lupus erythematosus; systemic sclerosis; chronic pain; chronic upper limb disorders; or Primary Sjögren's syndrome completed the Evaluati...