Table 3.

Hierarchical linear regression model when difference scores of Conner’s Adult ADHD Rating Scale were taken as dependent variables

		Unstandardized coefficients		Standardized coefficient	t	p
		B	Standard error	β
Inattention/memory problems
Model 1a	BDI	0.456	0.144	.448	3.166	.003**
	BAI	0.207	0.132	.232	1.563	.124
	AUDIT-K	0.126	0.120	.114	1.051	.298
	BIS-11	−0.032	0.076	−.043	−0.424	.673
Model 2b	BDI	0.466	0.141	.458	3.313	.002**
	BAI	0.065	0.149	.073	0.437	.664
	AUDIT-K	0.115	0.117	.104	0.982	.330
	BIS-11	−0.083	0.078	−.112	−1.060	.294
	WURS-KS	0.098	0.050	.263	1.944	.057
Model 3c	BDI	0.355	0.140	.349	2.545	.014*
	BAI	0.060	0.141	.067	0.425	.672
	AUDIT-K	0.092	0.112	.083	0.821	.415
	BIS-11	−0.119	0.076	−.161	−1.579	.120
	WURS-KS	0.071	0.049	.191	1.457	.151
	YIAT	0.122	0.045	.311	2.691	.009**
Hyperactivity/restless
Model 1d	BDI	0.065	0.119	.072	0.543	.589
	BAI	0.380	0.109	.484	3.474	.001**
	AUDIT-K	0.303	0.099	.312	3.060	.003**
	BIS-11	−0.002	0.063	−.003	−0.033	.974
Model 2e	BDI	0.072	0.117	.080	0.612	.543
	BAI	0.280	0.124	.357	2.265	.027*
	AUDIT-K	0.296	0.098	.304	3.023	.004**
	BIS-11	−0.038	0.065	−.058	−0.579	.565
	WURS-KS	0.069	0.042	.210	1.635	.108
Model 3f	BDI	−0.030	0.115	−.033	−0.261	.795
	BAI	0.275	0.116	.351	2.384	.021*
	AUDIT-K	0.274	0.092	.281	2.989	.004**
	BIS-11	−0.071	0.062	−.109	−1.143	.258
	WURS-KS	0.044	0.040	.134	1.098	.277
	YIAT	0.111	0.037	.325	3.003	.004**
Impulsivity/emotional lability
Model 1g	BDI	0.166	0.138	.171	1.201	.235
	BAI	0.365	0.127	.428	2.872	.006**
	AUDIT-K	0.207	0.115	.196	1.797	.078
	BIS-11	0.012	0.073	.017	0.169	.866
Model 2h	BDI	0.177	0.134	.182	1.319	.193
	BAI	0.215	0.141	.252	1.519	.134
	AUDIT-K	0.195	0.112	.185	1.749	.086
	BIS-11	−0.042	0.075	−.059	−0.558	.579
	WURS-KS	0.104	0.048	.291	2.159	.035*
Model 3i	BDI	0.060	0.131	.062	0.459	.648
	BAI	0.209	0.132	.246	1.586	.118
	AUDIT-K	0.170	0.105	.161	1.630	.109
	BIS-11	−0.080	0.071	−.113	−1.124	.266
	WURS-KS	0.075	0.046	.212	1.645	.106
	YIAT	0.128	0.042	.343	3.016	.004**
Problems with self-concept
Model 1j	BDI	0.873	0.202	.572	4.330	<.001**
	BAI	0.156	0.185	.116	0.841	.404
	AUDIT-K	0.136	0.168	.082	0.810	.421
	BIS-11	0.124	0.106	.112	1.172	0.246
Model 2k	BDI	0.884	0.200	.579	4.424	<.001**
	BAI	0.005	0.211	.004	0.025	.980
	AUDIT-K	0.125	0.167	.075	0.748	.458
	BIS-11	0.070	0.111	.063	0.629	.532
	WURS-KS	0.104	0.072	.186	1.452	.152
Model 3l	BDI	0.768	0.204	.504	3.763	<.001**
	BAI	<0.001	0.206	.000	0.000	.999
	AUDIT-K	0.100	0.163	.060	0.613	.543
	BIS-11	0.033	0.111	.029	0.295	.769
	WURS-KS	0.076	0.072	.136	1.064	.292
	YIAT	0.126	0.066	.215	1.907	.062

Note. BDI: Beck Depression Inventory; BAI: Beck Anxiety Inventory; BIS-11: Barratt Impulsiveness Scale-11; AUDIT-K: Korean version of Alcohol Use Disorder Identification Test; WURS-KS: Korean Short version of Wender Utah Rating Scale; YIAT: Korean version of Young’s Internet Addiction Test.

^aVariables entered in the first step: BDI, BAI, AUDIT-K, BIS-11; F = 11.485; df = 4, 56; p < .001; adjusted R² = 0.411.

^bVariables entered in the second step: WURS-KS; F = 10.400; df = 5, 55; p < .001; adjusted R² = 0.439; R² change = 0.035.

^cVariables entered in the third step: YIAT; F = 10.858; df = 6, 54; p < .001; adjusted R² = 0.496; R² change = 0.061.

^dVariables entered in the first step: BDI, BAI, AUDIT-K, BIS-11; F = 14.867; df = 4, 56; p < .001; adjusted R² = 0.480.

^eVariables entered in the second step: WURS-KS; F = 12.784; df = 5, 55; p < .001; adjusted R² = 0.495; R² change = 0.022.

^fVariables entered in the third step: YIAT; F = 13.708; df = 6, 54; p < .001; adjusted R² = 0.560; R² change = 0.066.

^gVariables entered in the first step: BDI, BAI, AUDIT-K, BIS-11; F = 11.194; df = 4, 56; p < .001; adjusted R² = 0.405.

^hVariables entered in the second step: WURS-KS; F = 10.473; df = 5, 55; p < .001; adjusted R² = 0.441; R² change = 0.043.

ⁱVariables entered in the third step: YIAT; F = 11.528; df = 6, 54; p < .001; adjusted R² = 0.513; R² change = 0.074.

^jVariables entered in the first step: BDI, BAI, AUDIT-KS, BIS-11; F = 15.259; df = 4, 56; p < .001; adjusted R² = 0.487.

^kVariables entered in the second step: WURS-KS; F = 12.870; df = 5, 55; p < .001; adjusted R² = 0.497; R² change = 0.018.

^lVariables entered in the third step: YIAT; F = 11.846; df = 6, 54; p < .001; adjusted R² = 0.520; R² change = 0.029.

^*p < .05. ^**p < .01.