Table 2 Confirmatory factor analysis of the ASSIST scale, two-factor model, in students from a public university in Londrina, Paraná, Brazil: standardized factor loadings (λ), standard error (SE), compatibility intervals (CI), and model fit indices

Scale items

Load (λ)

95% CI

SE

Moderate problems associated with alcohol consumption (F1)

 1. In the last 3 months, how often have you used alcohol?

0.666

0.632; 0.700

0.020

 2. During the last 3 months, how often have you had a strong desire or urge to use alcohol?

0.733

0.705; 0.761

0.017

 3. How often has your alcohol use led to health, legal, social, or financial problems?

0.869

0.842; 0.897

0.017

 4. How often have you failed to do what was normally expected of you because of your alcohol use?

0.818

0.789; 0.847

0.018

Serious problems associated with alcohol consumption (F2)

 5. Has a friend or relative or anyone else ever expressed concern about your alcohol use?

0.800

0.757; 0.844

0.026

 6. Have you ever tried to cut down on using alcohol but failed?

0.718

0.676; 0.793

0.026

Correlations between the factors

Φ

95% CI

SE

 F1 ↔ F2

0.753

0.712; 0.760

0.025

Fit indices (adequate reference value)

95% CI

 RMSEA (< 0.08)

0.033

0.020; 0.047

 CFI (> 0.95)

0.996

 TLI (> 0.90)

0.993

 F1 factor composite reliability (≥ 0.7)

0.852

 Average variance extracted from the F1 (≥ 0.5)

0.592

 F2 factor composite reliability (≥ 0.7)

0.731

 Average variance extracted from the F2 (≥ 0.5)

0.577