Assessing the psychometric properties of smoking-related attitudes, self-efficacy, and intention among a diverse population of middle school students.

Large-scale surveys frequently assess smoking-related attitudes, self-efficacy and intention to understand differences in smoking behavior. However, a critical assumption is that measures of these determinants should be equivalent across different subgroups of a target population. The current study examined the factorial invariance of measures of smoking-related attitudes, self-efficacy, and intention with a large sample (N=13,733) of middle school students from 25 schools in Texas. We examined five levels of factorial invariance using a sequential process, in which increasingly constrained models assess the equivalence of a measure across subgroups. Strong factorial invariance provided a good fit for the model across all of the subgroups: race/ethnicity (CFI=.93), gender (CFI=.96), age (CFI=.95), and grade level (CFI=.95). Invariance results provide strong empirical support for the validity of smoking-related attitudes, self-efficacy, and intention measures across race/ethnicity, gender, age, and grade level for middle school students.