Table 1.

Correlation matrix of the variables in the present study.

	ADHD	well-being	total caffeine	coffee	tea	energy drink	cola
well-being	−0.301
total caffeine	0.038	–0.029
coffeea	0.041	0.015	0.574
teaa	–0.036	0.073	0.104	−0.104
energy drinka	0.015	−0.079	0.116	−0.113	–0.005
colaa	–0.015	−0.049	0.066	−0.100	–0.033	−0.189
CUD	0.357	−0.207	0.233	0.209	−0.63	0.132	0.045

N = 2169–1994. Significant correlations (p < 0.05) are boldfaced. ADHD, Attention-deficit/hyperactivity disorder symptoms; CUD, Caffeine Use Disorder symptoms.

^aCoded as: 0 = Absence of daily consumption, 1 = Presence of daily consumption.