Confirmatory Factor Analysis.
Note. We tested a model supported by the initial exploratory factor analysis; with items 1–5 loading on the alcohol use leads to e-cig use (Scale 1) and items 6–8 loading onto the e-cig use leads to alcohol use (Scale 2). For simplicity, error terms are not shown. Fit indices for this model were good, suggesting adequate fit for the model: χ2=47.00, p<0.01, df=19; RMSEA=0.08, 90% CI=0.05–0.11; TLI=0.99; CFI=0.99.