Table 2.
Goodness-of-fit indices: 1-factor model (model 1, model 2) and 2-factor model (model 3) of the Generalized Anxiety Disorder 7-item scale (GAD-7), in adults (N = 821) employed in 4 economic sectors (health care, education, IT, public administration) during the initial phase of the COVID-19 pandemic, April 10–May 24, 2020, Poland
| Model | χ2 (df) | CFI | TLI | SRMR | RMSEA (90% CI) | AIC |
|---|---|---|---|---|---|---|
| Total sample | ||||||
| model 1 | 187.21 (14) | 0.97 | 0.99 | 0.03 | 0.12 (0.11–0.14) | 229.63 |
| model 2 | 46.69 (10) | 0.99 | 0.99 | 0.01 | 0.07 (0.05–0.09) | 99.71 |
| model 3 | 93.12 (13) | 0.99 | 0.98 | 0.02 | 0.09 (0.07–0.10) | 123.12 |
| Age | ||||||
| younger | ||||||
| model 1 | 85.26 (14) | 0.97 | 0.96 | 0.02 | 0.11 (0.09–0.13) | 113.26 |
| model 2 | 23.36 (10) | 0.99 | 0.99 | 0.01 | 0.06 (0.03–0.09) | 59.36 |
| model 3 | 51.48 (13) | 0.99 | 0.98 | 0.02 | 0.08 (0.06–0.11) | 81.48 |
| older | ||||||
| model 1 | 115.74 (14) | 0.96 | 0.94 | 0.02 | 0.14 (0.12–0.16) | 213.13 |
| model 2 | 31.39 (10) | 0.99 | 0.98 | 0.02 | 0.08 (0.05–0.11) | 67.39 |
| model 3 | 49.71 (13) | 0.97 | 0.98 | 0.02 | 0.09 (0.06–0.11) | 79.71 |
| Gender | ||||||
| women | ||||||
| model 1 | 168.65 (14) | 0.95 | 0.93 | 0.02 | 0.15 (0.13–0.17) | 210.65 |
| model 2 | 32.87 (10) | 0.99 | 0.99 | 0.02 | 0.07 (0.04–0.10) | 82.87 |
| model 3 | 63.51 (13) | 0.99 | 0.98 | 0.02 | 0.09 (0.07–0.11) | 93.51 |
| men | ||||||
| model 1 | 57.07 (14) | 0.98 | 0.97 | 0.02 | 0.10 (0.07–0.12) | 85.07 |
| model 2 | 40.41 (10) | 0.99 | 0.97 | 0.02 | 0.10 (0.07–0.13) | 76.41 |
| model 3 | 51.43 (13) | 0.98 | 0.97 | 0.02 | 0.094 (0.07–0.12) | 81.43 |
AIC – Akaike information criterion; CFI – comparative fit index; CI – confidence interval; df – degrees of freedom; RMSEA – root mean square error of approximation; SRMR – standardized root mean squared residual; TLI – Tucker-Lewis index.
Model 1 – 1-factor model; model 2 – modified 1-factor model (with correlated error covariances between items 2 and 4; 5, 6 and 7); model 3 – 2-factor model of correlated latent factors (first factor: items 1–4; second factor: items 5–7).
For each model: χ² significant at level p < 0.001.