Table 2.

Continuous demographic variables

	Daily light		Intermittent
	M	SD	M	SD	Range
Age	19.86	1.85	20.07	2.13	17.08–36.50	t(5,601) = −3.78, p < .01
Cigarettes per day	8.02	2.40	3.86	2.86	1.00–10.00	t(5,342) = 57.12, p < .01
Age of first puff	14.11	2.77	14.81	2.84	2.00–27.00	t(5,595) = −9.21, p < .01