Table 2.

Smoking Patterns Among Adolescents and Young Adults: Response Distribution of Outcome Variables, Indicator Variable, and Covariates^a

Variable	% (95% CIbb)
Outcome variable
Ever smoked 100 or more cigarettes
Yes	17.7 (16.9-18.5)
No	82.3 (81.5-83.1)
Age of initiation, y
≤13	18.5 (16.4-20.5)
14	13.6 (11.7-15.5)
15	16.7 (14.8-18.6)
16	19.7 (17.6-21.8)
17	14.4 (12.8-16.1)
≥18	17.1 (15.3-18.9)
Smoking status
Current smoker	13.9 (13.2-14.6)
Former smoker	3.8 (3.3-4.3)
Never smoker	82.3 (81.5-83.1)
Number of cigarettes smoked per day
≤5	31.1 (28.7-33.5)
6-10	28.9 (26.7-31.1)
11-15	11.7 (10.0-13.5)
16-20	22.9 (20.7-25.0)
≥21	5.4 (4.4-6.4)
Ever tried to quit for 1 day or longer
Yes	46.1 (43.3-48.9)
No	53.9 (51.1-56.7)
Number of quit attempts in previous 12 months
0	53.6 (50.3-56.9)
1	14.2 (11.6-16.9)
2	13.2 (11.2-15.2)
3	8.2 (6.6-9.8)
≥4	10.8 (8.6-13.0)
Time since quit
Quit for ≥180 days	59.7 (55.3-64.1)
Quit for <180 days	40.3 (35.9-44.7)
Indicator variable
Home smoking rules
No one is allowed to smoke anywhere	62.0 (61.0-63.1)
Smoking is allowed in some places or at some times	20.0 (19.2-20.7)
Smoking is permitted anywhere	18.0 (17.3-18.7)
Covariate
Age, y
15-16	35.4 (34.8-35.9)
17-18	31.4 (30.6-32.2)
19-24	33.2 (32.4-34.0)
Sex
Male	52.8 (52.1-53.5)
Female	47.2 (46.5-47.9)
Race or ethnicity
Non-Hispanic white	69.0 (68.3-69.7)
Non-Hispanic black	13.4 (12.8-14.0)
Hispanic	13.6 (13.1-14.2)
Other	4.0 (3.6-4.3)
Household income
<$19,999	23.1 (22.0-24.1)
$20,000-$39,999	23.0 (22.2-23.9)
$40,000-$59,999	20.3 (19.3-21.2)
≥$60,000	33.7 (32.7-34.7)
Smoking status of other household members
At least one other person in the household smokes	31.4 (30.5-32.3)
No one else in the household smokes	28.9 (27.8-29.9)
Unknown whether anyone else in the household smokes	39.7 (38.6-40.9)

^aBased on data from the 1998–1999 Tobacco Use Supplement to the Current Population Survey. Includes self-reporting respondents aged 15–24 years

^bCI indicates confidence interval.