. 2021 Aug 19;9:645980. doi: 10.3389/fpubh.2021.645980

Table 2.

Summary of the linear regression model of dependent variable days of khat use in the last 28 days.

	Step 1				Step 2				Step 3				Final model
Predictors	B	SE B	ß	P	B	SE B	ß	P	B	SE B	ß	P	B	SE B	ß	P
Constant	25.870	5.637		<0.001	24.694	5.652		<0.001	26.465	5.715		<0.001	27.287	5.017		<0.001
Age	−0.558	0.226	−0.103	0.014	−0.568	0.225	−0.105	0.012	−0.578	0.222	−0.107	0.009	−0.567	0.220	−0.105	0.010
CGPA	0.392	0.809	0.020	0.628	0.347	0.807	0.018	0.667	0.172	0.793	0.009	0.828	-	-	-	-
AUDIT	0.043	0.036	0.051	0.230	0.010	0.038	0.012	0.795	0.005	0.037	0.005	0.901	-	-	-	-
SRQ-20	-	-	-	-	0.109	0.080	0.071	0.170	0.048	0.081	0.031	0.553	-	-	-	-
PCL-5	-	-	-	-	0.010	0.023	0.022	0.680	0.007	0.023	0.015	0.775	-	-	-	-
LEC-5	-	-	-	-	0.082	0.091	0.044	0.364	0.086	0.089	0.046	0.335	-	-	-	-
Recognition	-	-	-	-	-	-	-	-	0.245	0.086	0.171	0.004	0.326	0.070	0.227	<0.001
Ambivalence	-	-	-	-	-	-	-	-	0.126	0.149	0.050	0.397	-	-	-	-
Taking Steps	-	-	-	-	-	-	-	-	−0.302	0.064	−0.249	<0.001	−0.288	0.059	−0.237	<0.001
F	F_3,571 = 2.411, p = 0.066				F_6,568 = 2.283, p = 0.035				F_9,565 = 4.325, p < 0.001				F_3,571 = 11.639, p < 0.001
AIC	2,466.629				2,466.163				2,447.555				2,439.738
R ²	0.013				0.024				0.064				0.058
Adj. R²	0.007				0.013				0.050				0.053
F Change	F_3,571 = 2.411, p = 0.066				F_3,568 = 2.141, p = 0.094				F_3,565 = 8.235, p < 0.001				-

CGPA, cumulative grade point average; AUDIT, Alcohol Use Disorder Identification Test; SRQ-20, Self-Report Questionnaire 20; PCL-5, PTSD Checklist for DSM-5; LEC-5, Life-Event Checklist for DSM-5; AIC, Akaike information criterion.