Table 5.

Factors associated with SDS in patients with MOH.

Characteristic		B	P-value	95.0% CI for B		Collinearity statistics
				Lower bound	Upper bound	Tolerance	VIF
(Constant)		−2.511	0.487	−9.644	4.622
Age		0.037	0.239	−0.025	0.098	0.715	1.399
Female sex		0.384	0.527	−0.816	1.584	0.628	1.591
BMI		−0.015	0.758	−0.111	0.081	0.782	1.279
Duration of MOH		0.020	0.844	−0.181	0.221	0.855	1.170
Type of primary headache disorder	Tension-type headache	−1.112	0.063	−2.287	0.063	0.759	1.317
	Cluster headache	−1.385	0.163	−3.337	0.567	0.740	1.352
MHD		−0.091	0.199	−0.231	0.049	0.273	3.664
AMD		0.254	0.002*	0.092	0.416	0.240	4.173
HIT-6 total score		0.086	0.046*	0.002	0.170	0.732	1.366
DASS-12 total score		−0.071	0.075	−0.148	0.007	0.435	2.301
SURPS total score		0.031	0.368	−0.037	0.100	0.448	2.234
Heavy caffeine consumption		−0.460	0.544	−1.955	1.035	0.476	2.102
CUDQ total score		0.160	0.002*	0.060	0.260	0.369	2.711

AMD, acute medication days; BMI, body mass index; CUDQ, Caffeine Use Disorder Questionnaire; DASS-12, Depression Anxiety Stress Scales–12; HIT-6, Headache Impact Test–6; MHD, monthly headache days; MOH, medication overuse headache; SDS, Severity of Dependence Scale; SURPS, Substance Use Risk Profile Scale.

Adjusted R square = 0.236.

*P-value < 0.05 is considered significant.