Table 3.

Model fit and comparison for structural equation models of work characteristics in relation to awakening problems

Model	Model Fit#				Model Comparison
	df	χ2	RMSEA	AIC	Model	Δ χ2	Model	Δ χ2
Demands
Model 0 (M0)	176	1142.10	0.042	1296.10
Model 1 (M1) Forward	175	1140.00	0.043	1296.00	M1 vs M0	2.1
Model 2 (M2) Reverse	175	1139.98	0.043	1295.98	M2 vs M0	2.12
Model 3 (M3) Reciprocal	174	1137.92	0.043	1295.92	M3 vs M0	4.18*
Decision Authority
Model 0 (M0)	74	264.63	0.029	388.63
Model 1 (M1) Forward	73	259.85	0.029	385.85	M1 vs M0	4.78*
Model 2 (M2) Reverse	73	260.24	0.029	386.24	M2 vs M0	4.39*
Model 3 (M3) Reciprocal	72	255.47	0.029	383.47	M3 vs M0	9.16**	M3 vs M1	4.38*
Support
Model 0 (M0)	218	1135.14	0.037	1299.14
Model 1 (M1) Forward	217	1130.69	0.037	1296.69	M1 vs M0	4.45*
Model 2 (M2) Reverse	217	1127.46	0.037	1293.46	M2 vs M0	7.68**
Model 3 (M3) Reciprocal	216	1123.33	0.037	1291.33	M3 vs M0	11.81***	M3 vs M2	4.13*

Analyses are controlled for sex, age, marital status, education, alcohol consumption, and job change.

df, degrees of freedom; RMSEA, root mean squared error of approximation; AIC, The Akaike Information Criterion.

^#Goodness of fit index (GFI) and comparative fit index (CFI) are not presented here as they did not change for M0-M3.

^*P < 0.05,

^**P < 0.01,

^***P < 0.001.