Table 2.
Confirmatory factor analysis of the Sleep Preoccupation Scale (SPS) n = 523
| Factor | Indicator | Factor loading | Residual variances | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Estimate | SE | z | p | Estimate | SE | z | p | ||
| CBC | SPS1 | 0.54 | 0.05 | 11.26 | < 0.001 | 0.93 | 0.06 | 15.61 | < 0.001 |
| SPS2 | 0.68 | 0.04 | 16.16 | < 0.001 | 0.61 | 0.04 | 14.73 | < 0.001 | |
| SPS3 | 0.73 | 0.04 | 16.8 | < 0.001 | 0.64 | 0.04 | 14.63 | < 0.001 | |
| SPS4 | 0.76 | 0.05 | 16.16 | < 0.001 | 0.77 | 0.05 | 14.79 | < 0.001 | |
| SPS5 | 0.59 | 0.05 | 12.08 | < 0.001 | 0.95 | 0.06 | 15.51 | < 0.001 | |
| SPS6 | 0.75 | 0.05 | 16.09 | < 0.001 | 0.75 | 0.05 | 14.83 | < 0.001 | |
| SPS7 | 0.67 | 0.05 | 13.74 | < 0.001 | 0.92 | 0.06 | 15.27 | < 0.001 | |
| SPS8 | 0.72 | 0.05 | 14.68 | < 0.001 | 0.88 | 0.06 | 15.09 | < 0.001 | |
| SPS9 | 0.80 | 0.05 | 17.57 | < 0.001 | 0.67 | 0.05 | 14.42 | < 0.001 | |
| SPS10 | 0.41 | 0.04 | 9.16 | < 0.001 | 0.87 | 0.06 | 15.82 | < 0.001 | |
| SPS11 | 0.74 | 0.04 | 16.59 | < 0.001 | 0.68 | 0.05 | 14.64 | < 0.001 | |
| SPS12 | 0.76 | 0.05 | 15.76 | < 0.001 | 0.82 | 0.06 | 14.86 | < 0.001 | |
| SPS13 | 0.62 | 0.05 | 13.59 | < 0.001 | 0.80 | 0.05 | 15.29 | < 0.001 | |
| SPS14 | 0.72 | 0.05 | 14.29 | < 0.001 | 0.94 | 0.06 | 15.21 | < 0.001 | |
| AC | SPS15 | 0.77 | 0.04 | 17.6 | < 0.001 | 0.61 | 0.04 | 14.19 | < 0.001 |
| SPS16 | 0.80 | 0.04 | 18.45 | < 0.001 | 0.57 | 0.04 | 13.89 | < 0.001 | |
| SPS17 | 0.88 | 0.04 | 20.12 | < 0.001 | 0.52 | 0.04 | 13.19 | < 0.001 | |
| SPS18 | 0.76 | 0.05 | 16.36 | < 0.001 | 0.74 | 0.05 | 14.62 | < 0.001 | |
| SPS19 | 0.77 | 0.05 | 16.39 | < 0.001 | 0.75 | 0.05 | 14.57 | < 0.001 | |
| SPS20 | 0.78 | 0.05 | 16.49 | < 0.001 | 0.76 | 0.05 | 14.48 | < 0.001 | |
| SPS21 | 0.74 | 0.05 | 15.2 | < 0.001 | 0.84 | 0.06 | 14.90 | < 0.001 | |
| SPS22 | 0.86 | 0.05 | 17.96 | < 0.001 | 0.72 | 0.05 | 14.00 | < 0.001 | |
Notes Model fit chi-square test: Baseline model: χ² = 4876.48, df = 231, p < 0.001; Factor model: χ² = 743.04, df = 208, p < 0.001. Fit Indices: Comparative Fit Index (CFI): 0.89, Tucker‒Lewis Index (TLI): 0.87, Bentler-Bonett Nonnormed Fit Index (NNFI): 0.87, Bentler-Bonett Normed Fit Index (NFI): 0.85, Parsimony Normed Fit Index (PNFI): 0.76, Bollen’s Relative Fit Index (RFI): 0.83, Bollen’s Incremental Fit Index (IFI): 0.89, Relative Noncentrality Index (RNI): 0.89. The following information criteria were used: log-likelihood: -15702.88, number of free parameters: 67, Akaike information criterion (AIC): 31539.75, Bayesian information criterion (BIC): 31825.15, and sample-size adjusted Bayesian information criterion (SSABIC): 31612.47. Other Fit Measures: Root mean square error of approximation (RMSEA): 0.07, RMSEA 90% CI lower bound: 0.07, RMSEA 90% CI upper bound: 0.08, RMSEA p value: 0.00, Standardized root mean square residual (SRMR): 0.05, Hoelter’s critical N (α = 0.05): 171.79, Hoelter’s critical N (α = 0.01): 182.86, Goodness-of-fit index (GFI): 0.96, McDonald fit index (MFI): 0.60, Expected cross-validation index (ECVI): 1.68, Kaiser‒Meyer‒Olkin (KMO) Test: Overall KMO test: 0.93, Bartlett’s test of Sphericity: Bartlett’s test: χ² = 4791.01, df = 231, p < 0.001. The average variance extracted (AVE) was 0.37 for Factor 1 and 0.48 for Factor 2. HTMT: Factor 1 to Factor 2: 0.70. Note: The confirmatory factor analysis was conducted using the maximum likelihood (ML) estimator