Table 2.

Summary statistics and statistical analyses of associations among completion groups, explanatory variables, and covariates.

			Attrition					Analysis
			Completers (n=40)		Noncompleters (n=26)		Test			df		Test statistic		P value
Treatment intensity (%)
	Low intensity	75.76		24.24		Chi-square test			1		4.6		.03
	High intensity	46.88		53.13		—a			—		—		—
Treatment length (weeks), median (IQR)
	Length	7 (5-12.25)		12 (6-22.25)		Mann-Whitney U test			N/Ab		339.5		.05
Covariates, mean (SD)
	Anxiety severityc	12.33 (4.66)		15.4 (4.06)		t test			56.28		-2.80		.007
	Depression severityd	16.65 (5.08)		16.88 (5.17)		t test			50.40		-0.18		.86
	Study length (weeks)	29.38 (6.02)		29.92 (7.56)		t test			45.02		-0.31		.76

^aNot available.

^bN/A: not applicable.

^cAnxiety was measured with the Generalized Anxiety Disorder 7-item scale questionnaire.

^dDepression was measured using the Patient Health Questionnaire 9-item.