Title: How to measure comorbidity: a critical review of available methods
Abstract: We would like to thank Rozzini et al. for their letter regarding the Geriatric Index of Comorbidity (GIC). The GIC was not included in our review [ [1] de Groot V. Beckerman H. Lankhorst G.J. et al. How to measure comorbidity: a critical review of available methods. J Clin Epidemiol. 2003; 56: 221-229 Abstract Full Text Full Text PDF PubMed Scopus (1318) Google Scholar ] because it was only recently published [ [2] Rozzini R. Frisoni G.B. Ferrucci L. et al. Geriatric Index of Comorbidity: validation and comparison with other measures of comorbidity. Age Ageing. 2002; 31: 277-285 Crossref PubMed Scopus (170) Google Scholar ]. On the basis of their publication and Letter to the Editor, we will briefly review the GIC according to the criteria applied in our review of comorbidity measures [ [1] de Groot V. Beckerman H. Lankhorst G.J. et al. How to measure comorbidity: a critical review of available methods. J Clin Epidemiol. 2003; 56: 221-229 Abstract Full Text Full Text PDF PubMed Scopus (1318) Google Scholar ].