Table 4.

Changes in outcome variables pre-/post test.

Measure	Preintervention, mean (SD)	Postintervention, mean (SD)	t	df	P	Cohen d
Perceived Stress Scale score	19.16 (4.58)	17.5 (5.11)	3.38	89	.001	0.37
Overall Anxiety Severity and Impairment Scale score	8.05 (4.02)	6.63 (3.44)	3.80	89	<.001	0.40
Impact of Events Scale—Revised score	2.29 (0.58)	2.01 (0.51)	4.02	89	<.001	0.42
University of California Los Angeles Loneliness Scale score	2.73 (0.77)	2.51 (0.85)	3.74	89	<.001	0.40
Brief Penn State Worry Questionnaire score	8.95 (3.15)	8.82 (2.79)	2.77	89	.007	0.29
Cortisol (morning)	0.33 (0.36)	0.48 (1.35)	–0.99	79	.32	–0.11
Cortisol (evening) average	0.06 (0.08)	0.14 (0.62)	–1.25	80	.21	–0.14
Average cortisol slope	–0.44 (0.47)	–0.54 (1.22)	0.81	79	.41	0.09