Table 2. Changes in outcomes from baseline to 1, 3, and 6-month follow-up post-intervention among study completers (PP-analysis, N=88) and ITT-analysis for the primary outcome PSQ_total considering all randomized persons (participants N=90 and non-participants N=19) with missing value imputation using the “Last Observation Carried Forward” method.

	Intervention Group			Waiting Control Group
		Change from baseline			Change from baseline		Change from baseline – Difference between groups		Effect size	Between-group ANCOVA*1
	N	Mean	SD	N	Mean	SD	Mean [95%CI]	Pooled SD	Cohen’s d	Parameter estimate for group [95%CI]
PSQ_total (PP)
at 1 month	43	–33.45	14.21	45	–1.85	9.46	–31.60 [–37.07; –24.61]*2	12.02	–2.63	–31.37 [–36.20; –26.54]*4
at 3 months	43	–27.13	15.70	44	–5.64	15.49	–21.49 [–28.25; –13.50]*2	15.59	–1.38	–21.27 [–27.65; –14.89]*4
at 6 months	43	–28.33	16.50	44	–2.84	10.77	–25.49 [–32.13; –18.46]*2	13.90	–1.83	–25.43 [–31.09; –19.77]*4
PSQ_total (ITT)
at 1 month	54	–26.64	18.57	55	–1.73	8.67	–24.91 [–31.42; –18.45]*2	14.45	–1.72	–24.92 [–30.27; –19.56]*4
at 3 months	54	–21.60	17.81	55	–3.94	14.51	–17.66 [–24.60; –10.78]*2	16.23	–1.09	–17.67 [–23.67; –11.68]*4
at 6 months	54	–22.56	18.67	55	–2.00	10.00	–20.56 [–27.20; –13.97]*2	14.94	–1.38	–20.57 [–26.09; –15.04]*4
WHO-5 (PP)
at 1 month	43	32.65	16.28	45	3.47	15.27	29.18 [22.76; 38.04]*2	15.77	1.85	29.60 [23.23; 35.96]*4
at 3 months	43	24.09	18.75	44	5.18	14.78	18.91 [11.29; 28.51]*2	16.86	1.12	19.15 [12.09; 26.21]*4
at 6 months	43	23.44	20.80	44	2.18	15.42	21.26 [14.95; 31.54]*2	18.28	1.16	22.07 [14.67; 29.48]*4
MBI_EE (PP)
at 1 month	42	–1.08	0.79	45	0	0.55	–1.08 [–1.30; –0.71]*2	0.68	–1.59	–1.05 [–1.31; –0.79]*4
at 3 months	42	–1.06	0.72	44	0.07	0.56	–1.13 [–1.38; –0.70]*2	0.64	–1.77	–1.11 [–1.38; –0.84]*4
at 6 months	41	–1.03	0.95	45	0.08	0.54	–1.11 [–1.44; –0.68]*2	0.76	–1.46	–1.10 [–1.42; –0.78]*4
EQ5D_Health state (PP)
at 1 month	42	21.12	15.86	45	2.18	17.35	18.94 [9.39; 21.27]*2	16.65	1.14	16.55 [10.95; 22.15]*4
at 3 months	42	17.07	19.31	45	1.64	17.35	15.43 [4.90; 17.85]*3	18.32	0.84	12.85 [6.60; 19.09]*5
at 6 months	42	19.71	16.93	43	3.67	16.97	16.04 [5.29; 18.43]*3	16.95	0.95	13.74 [7.69; 19.79]*4

*¹ Between-group ANCOVA adjusted for baseline values (in the case of non-participants values from eligibility testing were used)

*² p-value for t-test comparison of means between groups <0.0001;

*³ p-value for t-test comparison of means between groups <0.001

*⁴ p-value for between-group ANCOVA <0.0001;

*⁵ p-value for between-group ANCOVA <0.001