Table 2.

Results of equivalence testing for treatment engagement, retention, and satisfaction measures.

	Marijuana or Alcohol Problem Use		Opioid Problem Use		SE	z1	z2	Cohen’s d
	Mean (%)	SD	Mean (%)	SD
Initiation	79%	0.4	82%	0.4	0.02	8.08	−5.77	0.07
Engagement	63%	0.5	67%	0.5	0.03	5.91	−3.10	0.08
Count of client only sessions a	7.1	4.5	7.0	4.0	0.32	2.50	−3.10	−0.02
Count caregiver or significant other only session a	0.9	1.3	0.9	1.1	0.09	2.62	−2.99	−0.01
Count family session a	0.8	1.2	0.9	1.2	0.09	4.33	−1.23	0.11
Total number of sessions a	8.9	5.7	8.9	5.0	0.41	2.63	−2.99	−0.01
Total number of sessions in Months 4 – 6	1.7	3.4	2.1	4.0	0.21	5.15	−1.28	0.12
Treatment Satisfaction Scale	11.7	6.0	12.5	4.5	0.38	5.45	−0.84	0.15

Notes.

Bold type indicates the two groups were significantly equivalent.

Effect sizes can be interpreted as Cohen’s d, where a small effect ≥ .20; medium effect ≥ .5; and large effect ≥ .80.

^aIntake through 3 months.