Table 2.

Relationship between CUDQ as a dependent variable and DASS-21 total scores and total caffeine intake

	DASS-21 total scores			Total caffeine intakes
	β	95 % CI	P	β	95 % CI	P
Model 1	0·176	0·147, 0·204	< 0·001 *	0·008	0·005, 0·011	< 0·001 *
Model 2	0·177	0·148, 0·205	< 0·001 *	0·006	0·004, 0·009	< 0·001 *
Model 3	0·176	0·148, 0·205	< 0·001 *	0·005	0·004, 0·006	< 0·001 *

CUDQ, caffeine use disorder questionnaire.

^* P < 0·0001.

Model 1. Crude model.

Model 2. Including model 1 and adjusted for age and sex.

Model 3. Including model 2 and adjusted for marital status and smoking status.