Study ID Main report Objective Methods used for Bolt-on Sample Methods used for Impact of identifying bolt-on tested size testing bolt-on bolt-on dimensions dimensions 1 Gudex To investigate Previous large scale survey 340 Comparison of No impact Energy (1991) the impact of health status based including an on VAS for EQ-5D energy/ with and EQ-5D tiredness without bolt-on dimension to the 3L version of the EQ-5D 2 Krabbe et al To investigate Expert opinion of a Dutch Cognition 87 Comparison of Impact (1999) the impact of group of experts health state values adding a for paired health cognitive states based on VAS dimension to with and without the 3L bolt-on using T tests version of the EQ-5D
Study ID Main report Objective Methods used for identifying bolt-on dimensions Bolt-on tested Sample size Methods used for testing bolt-on dimensions Impact of bolt-on 1 Gudex (1991) To investigate the impact of including an energy/ tiredness dimension to the 3L version of the EQ-5D Previous large scale survey Energy 340 Comparison of health status based on VAS for EQ-5D with and EQ-5D without bolt-on No impact 2 Krabbe et al (1999) To investigate the impact of adding a cognitive dimension to the 3L version of the EQ-5D Expert opinion of a Dutch group of experts Cognition 87 Comparison of health state values for paired health states based on VAS with and without bolt-on using T tests Impact
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