Table 4.

Logistic regressions for motivations to misuse prescription stimulants predicting mental health problems.

Model variables	B	SE	p	OR	95% CIOR
Past year any mental illness vs. No past year mental illness a
Intercept (Did not misuse this substance)	0.69	0.05	.000	2.00	[1.82, 2.19]
Help lose weight	0.05	0.24	.849	1.05	[0.64, 1.71]
Help concentrate	−0.07	0.10	.485	0.93	[0.76, 1.14]
Help be alert or stay awake	0.01	0.08	.918	1.01	[0.86, 1.18]
Help study	−0.64	0.11	.000	0.53	[0.42, 0.66]
Experiment/see what like	0.06	0.20	.759	1.07	[0.71, 1.61]
Feel good/get high	0.22	0.15	.155	1.24	[0.92, 1.68]
Increase/decrease effect of other drugs	0.11	0.40	.790	1.11	[0.50, 2.46]
Some other reason	0.74	0.33	.028	2.09	[1.09, 4.01]
Misused, no motivation endorsed	−1.06	0.29	.001	0.35	[0.19, 0.62]
Did not misuse any substance	−1.20	0.03	.000	0.30	[0.28, 0.32]
Past year serious mental illness vs. No past year serious mental illness b
Intercept (Did not misuse this substance)	−0.53	0.06	.000	0.59	[0.52, 0.67]
Help lose weight	0.51	0.29	.088	1.66	[0.93, 2.99]
Help concentrate	−0.11	0.13	.378	0.89	[0.69, 1.15]
Help be alert or stay awake	−0.06	0.11	.596	0.95	[0.77, 1.17]
Help study	−0.66	0.17	.000	0.52	[0.37, 0.73]
Experiment/see what like	0.41	0.26	.129	1.50	[0.89, 2.54]
Feel good/get high	−0.00	0.17	.994	1.00	[0.72, 1.39]
Increase/decrease effect of other drugs	−0.71	0.47	.140	0.49	[0.19, 1.27]
Some other reason	0.43	0.35	.225	1.53	[0.76, 3.09]
Misused, no motivation endorsed	−0.91	0.44	.043	0.41	[0.17, 0.97]
Did not misuse any substance	−1.36	0.05	.000	0.26	[0.23, 0.28]
Past year major depressive episode vs. No past year major depressive episode c
Intercept (Did not misuse this substance)	−0.21	0.06	.000	0.81	[0.72, 0.90]
Help lose weight	0.38	0.24	.118	1.46	[0.91, 2.35]
Help concentrate	−0.08	0.10	.465	0.93	[0.75, 1.14]
Help be alert or stay awake	−0.09	0.11	.425	0.92	[0.74, 1.14]
Help study	−0.45	0.17	.009	0.64	[0.46, 0.89]
Experiment/see what like	0.33	0.24	.172	1.39	[0.86, 2.22]
Feel good/get high	0.10	0.16	.528	1.11	[0.80, 1.54]
Increase/decrease effect of other drugs	−0.36	0.51	.486	0.70	[0.25, 1.95]
Some other reason	0.57	0.27	.038	1.77	[1.03, 3.04]
Misused, no motivation endorsed	−1.46	0.56	.012	0.23	[0.08, 0.71]
Did not misuse any substance	−1.09	0.05	.000	0.34	[0.31, 0.37]
Past year serious thoughts of suicide vs. No past year serious thoughts of suicided
Intercept (Did not misuse this substance)	−0.56	0.07	.000	0.57	[0.50, 0.65]
Help lose weight	0.22	0.33	.514	1.25	[0.64, 2.43]
Help concentrate	−0.24	0.14	.090	0.79	[0.60, 1.04]
Help be alert or stay awake	−0.05	0.13	.696	0.95	[0.73, 1.23]
Help study	−0.69	0.14	.000	0.50	[0.38, 0.67]
Experiment/see what like	−0.02	0.26	.946	0.98	[0.58, 1.66]
Feel good/get high	0.20	0.17	.244	1.22	[0.87, 1.71]
Increase/decrease effect of other drugs	−0.70	0.42	.104	0.50	[0.21, 1.16]
Some other reason	0.41	0.34	.237	1.50	[0.76, 2.96]
Misused, no motivation endorsed	−0.64	0.43	.144	0.53	[0.22, 1.25]
Did not misuse any substance	−1.35	0.05	.000	0.26	[0.24, 0.29]

Note. Included age, sex, household income, population density, and race as covariates. Reference category = No misuse of this prescription drug.

^aModel: Wald F(24, 27) = 155.38, p < .001, R² = .06 (Cox & Snell), .09 (Nagelkerke).

^bModel: Wald F(24, 27) = 87.50, p < .001, R² = .03 (Cox & Snell), .10 (Nagelkerke).

^cModel: Wald F(24, 27) = 177.76, p < .001, R² = .04 (Cox & Snell), .09 (Nagelkerke).

^dModel: Wald F(24, 27) = 84.54, p < .001, R² = .03 (Cox & Snell), .09 (Nagelkerke).