Table 2.
Model fitting results for measurement invariance tested across sex and age
| N | Free parameters | RMSEA | |
|---|---|---|---|
| Exploratory factor analysis: one-factor solution | 15,320 | 10 | .038 |
| Configural invariance: Males—12–18 years old | 1,255 | 30 | .041 |
| Configural invariance: Females—12–18 years old | 1,488 | 30 | .032 |
| Configural invariance: Males—19–27 years old | 2,129 | 30 | .044 |
| Configural invariance: Females—19–27 years old | 3,284 | 30 | .035 |
| Configural invariance: Males—28–59 years old | 2,497 | 30 | .065 |
| Configural invariance: Females—28–59 years old | 4,667 | 30 | .037 |
| Configural invariance: Total sample | 15,320 | 180 | .044 |
| Metric invariance | 15,320 | 180 | .047 |
| Strong factorial invariance | 15,320 | 90 | .053 |
| Strict factorial invariance | 15,320 | 40 | .060 |