Simplified scoring and psychometrics of the revised 12-item Short-Form Health Survey

Abstract

The 12-item Short-Form Health Survey was developed to describe mental and physical health status of adults and to measure the outcomes of healthcare services. Based on testing of the original SF-12 with a group of older adults, a revised scoring system and measurement model of the SF-12 Health Survey was proposed. The purpose of this study was to test the reliability and validity of this revised measurement model and scoring system. Testing was done with a sample of 187 older adults in a continuing care retirement community and a sample of 211 older adults discharged from an acute care setting. There was sufficient evidence for the internal consistency of the revised SF-12 (Cronbach alpha coefficients of 0.72 to 0.89); test retest reliability (r = 0.73-0.86); reliability based on R2 values; and validity based on confirmatory factor analysis, contrasted groups, and hypothesis testing. The revised SF-12 is a valid and reliable measure that can be used with confidence to measure outcomes for older adults.