Table 4. Concurrent hierarchical linear regression analyses with insomnia symptoms as the dependent variable, and age, sex, doubts about action, anxiety and depression as predictors at baseline.

Predictors in the model	R2	β	t	Sig.
Step 1
Age	.01	.08	0.72	.47
Step 2
Age	.01	.08	0.73	.47
Sex		.06	0.55	.59
Step 3
Age	.09	.14	1.19	.24
Sex		.03	0.28	.78
Doubts About Action		.28	2.44	.02*
Step 4	.28
Age		.07	0.70	.49
Sex		-.04	-0.38	.71
Doubts About Action		.09	0.81	.42
Anxiety		.48	4.30	.01**
Step 5	.35
Age		.04	0.35	.73
Sex		.03	0.27	.79
Doubts About Action		.06	0.56	.58
Anxiety		.26	1.92	.05*
Depression		.37	2.90	.01**

Notes

*Significant for p-level < .05.

** Significant for p-level < .01.