Table 1.

Demographic data of participating subjects. Note that smoking status for the pediatric formulation refers to that of parent (most heavily smoking one if different between parents). Data are means ± SD or percentages of given group

	ER capsules	Adult syrup	Pediatric syrup	Pastilles	Total
n	231	233	244	233	941
Gender, % male	38.0	31.8	40.9	38.2	37.2
Age, years	41.2 ± 15.4	39.3 ± 17.5	12.8 ± 12.8	35.7 ± 15.1	32.0 ± 19.1
Smoking status, % regular/occasional/non-smoker	22.4/17.5/60.1	21.6/18.9/59.5	4.5/8.0/87.5	17.2/12.7/70.1	18.1/15.2/66.7