TY - JOUR T1 - Measuring morbidity: disease counts, binary variables, and statistical power. JF - J Gerontol B Psychol Sci Soc Sci Y1 - 2000 A1 - Kenneth F Ferraro A1 - Janet M Wilmoth KW - Adult KW - Aged KW - Chronic disease KW - Cross-Sectional Studies KW - Female KW - Geriatric Assessment KW - Health Surveys KW - Humans KW - Longitudinal Studies KW - Male KW - Middle Aged KW - Models, Statistical KW - United States AB -

OBJECTIVES: This study compares the use of the binary disease variables with counts of the same conditions in models of self-rated health to better understand the advantages and disadvantages of each approach. In particular, the analysis seeks to determine if statistical power is adequate for the binary variable approach.

METHODS: Morbidity measures from adults in 2 large national surveys were used in both cross-sectional and longitudinal analyses.

RESULTS: Although differences across the approaches are modest, the binary variable approach offers greater explanatory power and slightly higher R2 values. Despite these advantages, statistical power is insufficient in some cases, especially for conditions that are relatively rare and/or that manifest modest differences on the outcome variable.

DISCUSSION: Statistical power estimates are advisable when using the binary variable approach, especially if the list of diseases and health conditions is extensive. Although a simple count of diseases may be useful in some research applications, separate counts for serious and nonserious conditions should be more useful in many research projects while avoiding the risk of inadequate statistical power.

PB - 55B VL - 55 IS - 3 U1 - http://www.ncbi.nlm.nih.gov/pubmed/11833985?dopt=Abstract U4 - Disease/Morbidity/Subjective Probabilities ER -