Table 2.

Standardized parameter estimates from 3 models starting with the full model and then performing exploratory model alterations to obtain the best-fitting model (n=1088). Model 1 includes all variables shown in Figure 1, the original conceptual model. Model 2 does not include positive affect variable. In Model 3, error variances for the following variable pairs were allowed to correlate: 1) negative affect and somatic symptoms and 2) chewing and opening limitation.

	Model 1*	Model 2+	Model 3ǂ
Psychological unease
Somatic symptoms	0.660	0.793	0.605
Catastrophizing	0.555	0.608	0.777
Positive affect	−0.595
Negative affect	0.783	0.615	0.448
Jaw limitation
Chewing limitation	0.771	0.773	0.604
Opening limitation	0.887	0.882	0.707
Expression limitation	0.716	0.722	0.899
Experimental pain sensitivity
Thermal tolerance	0.548	0.542	0.552
Pressure pain threshold	0.413	0.413	0.412
Mechanical pain rating	−0.512	−0.517	−0.509
Mechanical temporal summation	−0.451	−0.453	−0.454
Chi2 (df)	314 (41)	166 (32)	93 (30)
p-value	<0.001	<0.001	<0.001
RMSEA (90% CI)	0.078 (0.070, 0.086)	0.062 (0.053, 0.071)	0.044 (0.034, 0.054)
CFI	0.886	0.934	0.969
TLI	0.847	0.907	0.953
SRMR	0.065	0.051	0.036

^*Model 1: full model including all variables from proposed conceptual model ;

⁺Model 2: dropped variable measuring positive affect;

^ǂModel 3: allowed correlation between negative affect and somatic symptoms and correlation between chewing and opening limitation; df=degrees of freedom; RMSEA= Root mean squared error; CI=confidence intervals; CFI=Comparative Fit Index; TLI=Tucker Lewis Index; SRMR=Standardized Root Mean Square Residual