Table 2.

Results for the primary outcome stress-level measured with the global scale of the “Perceived Stress Questionnaire” (PSQ).

	Parameter	Estimate (SE)	Statistics
Results of the multilevel model	Intercept	59.49 (2.00)	t(76.20) = 29.68; p < 0.01
	Intercept* intervention	4.68 (2.76)	t(76.44) = 1.70; p = 0.09
	Time1	−6.17 (2.55)	t(68.99) = −2.42; p = 0.02
	Time1* intervention	−14.81 (3.50)	t(68.95) = −4.23; p < 0.01
	Time2	−5.90 (3.05)	t(72.10) = −1.93; p = 0.06
	Time2* intervention	−13.85 (4.11)	t(71.73) = −3.37; p < 0.01
	Time	Condition	d
Effect sizes (d)	Time1	PE	0.57
		FR + PE	1.57
	Time2	PE	0.67
		FR + PE	1.39
	Assessment point	Condition	M (SD)
Descriptive statistics	Pre-treatment (t0)	PE	59.49 (9.72)
		FR + PE	64.25 (14.05)
	Post-treatment (t1)	PE	53.91 (14.50)
		FR + PE	42.22 (17.09)
	6-month follow-up (t2)	PE	52.94 (16.94)
		FR + PE	44.65 (19.22)

PE, Psychoeducation; FR, Functional Relaxation; Time1, Change from pre-treatment (t0) to post-treatment (t1); Time2, Change from pre-treatment (t0) to 6-month follow-up (t2).