Table 4.

Predictors of treatment outcome in EA and A

Baseline variables	Sample	Univariate models			Multivariate modela
		OR	95% CI	p value	OR	95% CI	p value
Age of onset	EA A	0.93 0.95	0.80; 1.09 0.89; 1.02	0.382 0.156
Age at intake	EA A	0.87 0.98	0.74; 1.03 0.96; 1.00	0.100 0.041	0.90 0.99	0.75; 1.07 0.97; 1.01	0.219 0.419
Previous inpatient stay	EA A	1.22 1.44	0.64; 2.34 0.87; 2.38	0.552 0.154
Female	EA A	0.76 0.98	0.38; 1.51 0.57; 1.70	0.431 0.951
Lower education	EA A	1.39 1.73	0.72; 2.69 1.05; 2.84	0.322 0.031	1.42	0.84; 2.40	0.189
Illicit drug use	EA A	3.12 1.29	0.63; 15.56 0.80; 2.09	0.165 0.303
Ever injected	EA A	1.68 1.69	0.88; 3.22 1.07; 2.66	0.118 0.025	1.20	0.72; 2.01	0.479
Polysubstance use	EA A	2.51 1.39	1.06; 5.93 0.88; 2.21	0.036 0.162	3.08	1.22; 7.44	0.017
Mental distress	EA A	1.28 1.74	0.81; 2.03 1.25; 2.43	0.292 0.001	1.63	1.15; 2.32	0.006
Motivation	EA A	0.85 0.83	0.56; 1.28 0.62; 1.12	0.424 0.223
Affective disorders	EA A	0.55 1.26	0.24; 1.25 0.70; 2.26	0.152 0.446
Anxiety	EA A	0.78 1.12	0.38; 1.57 0.69; 1.96	0.478 0.564
Personality	EA A	1.22 1.72	0.46; 3.27 0.67; 2.41	0.692 0.462
ADHD	EA A	2.29 2.33	1.06; 4.93 1.21; 4.65	0.035 0.012	3.20 1.99	1.35; 7.59 0.98; 4.06	0.009 0.059
Treatment site	EA A	0.74 0.78	0.38; 1.42 0.40; 1.50	0.360 0.449	0.64 0.73	0.30; 1.35 0.36; 1.47	0.241 0.374

EA, emerging adults; A, adults; OR, odds ratio; CI, confidence interval; ADHD, attention deficit hyperactivity disorder; EA, Nagelkerke R² = 0.129, Cox and Snell R² = 0.096, N = 137; A, Nagelkerke R² = 0.085, Cox and Snell R² = 0.060, N = 339. Significant p values (<0.05) are in bold.

^aResults of multivariable logistic regression analysis including variables with p < 0.10 in bivariable analysis.