Table 4.

Efficacy (linear mixed-effects models) of the intervention.

Variable			Estimate		95% CI		t test (df)		P value	Cohen d
SPS-Ra total score
	Time	–1.17		–2.02, –0.33		–2.73 (204.50)		.007		—b
	Group	0.77		–0.58, 2.13		1.13 (161.78)		.26		—
	Time × group	–1.59		–2.83, –0.34		–2.50 (203.88)		.01		0.67
SPS-R Symptom Severity
	Time	–0.73		–1.17, –0.29		–3.24 (198.83)		.001		—
	Group	0.60		–0.09, 1.30		1.71 (155.82)		.09		—
	Time × group	–1.01		–1.67, –0.36		–3.06 (197.60)		.003		0.79
SPS-R Impairment
	Time	–0.44		–0.97, 0.09		–1.64 (206.48)		.10		—
	Group	0.19		–0.71, 1.09		0.42 (172.50)		.67		—
	Time × group	–0.57		–1.35, 0.21		–1.44 (206.31)		.15		0.4
KPD-38c total score
	Time	0.02		–0.08, 0.11		0.31 (202.04)		.76		—
	Group	0.02		–0.16, 0.20		0.22 (166.86)		.83		—
	Time × group	–0.05		–0.20, 0.09		–0.72 (200.85)		.47		0.2
Skin Picking Impact Scale
	Time	–0.16		–1.99, 1.68		–0.17 (204.78)		.87		—
	Group	–0.87		–4.14, 2.40		–0.52 (171.56)		.60		—
	Time × group	–1.82		–4.52, 0.87		–1.34 (203.91)		.18		0.37
MIDAS d focused skin picking
	Time	0.20		–0.68, 1.07		0.44 (205.10)		.66		—
	Group	0.15		–1.38, 1.69		0.20 (174.80)		.84		—
	Time × group	–0.60		–1.89, 0.68		–0.93 (204.56)		.35		0.26
MIDAS automatic skin picking
	Time	0.06		–0.71, 0.84		0.17 (203.64)		.87		—
	Group	–0.32		–1.75, 1.10		–0.45 (164.29)		.65		—
	Time × group	–0.41		–1.55, 0.73		–0.71 (202.19)		.48		0.19

^aSPS-R: Skin Picking Scale–Revised.

^bNot applicable.

^cKPD-38: Clinical Psychological Diagnosis System–38.

^dMIDAS: Milwaukee Inventory for the Dimensions of Adult Skin Picking.