Page 52 - Development of Questionnaires for Quantitative Medical Research
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General       Physical
                     health       activities


              Vitality                       Social
                                            activities

                               Health
               Role
             activities         QoL           Role
              due to                        activities
             emotional                       due to
             problems                       physical
                                            problems
                       Mental      Bodily
                       health       pain



         Figure 2.2: An example of latent variables to
        represent a measure of health-related quality of
                             life
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