TABLE 2—

Unadjusted and Adjusted Odds Ratios (ORs) From Stepwise Logistic Regression for Ever Smoking: 2125 Middle-School Students, Tracy, Calif, 2003

	Unadjusted OR	CI	Adjusted ORa	CI
Grade
6thb
7th	2.7	2.0, 3.7	2.0	1.4, 2.9
8th	4.5	3.3, 6.1	3.0	2.1, 4.3
Gender
Femaleb
Male	1.1	0.9, 1.4	NS
Ethnicity
Not Latino or Hispanicb
Latino or Hispanic	1.4	1.1, 1.7	NS
Self-reported grades
Above medianb
Below median	2.7	2.2, 3.4	1.5	1.2, 2.0
Parent or household smoking
Nob
Yes	2.6	2.1, 3.2	1.8	1.4, 2.3
At least 1 friend smokes
Nob
Yes	6.6	5.2, 8.3	3.1	2.4, 4.0
Maternal supervision
Above meanb
Below mean	1.9	1.5, 2.4	1.5	1.1, 1.9
Risk taking
Below meanb
Above mean	6.7	5.1, 8.9	3.4	2.5, 4.7
Own cigarette promotional item
Nob
Yes	6.0	4.7, 7.8	2.7	2.0, 3.6
See cigarette advertisements in magazines
Never or rarelyb
Sometimes or often	2.5	2.0, 3.1	1.4	1.1, 1.8
See smoking on television or in movies
Never or rarelyb
Sometimes or often	2.2	1.7, 2.8	NS
Exposure to retail tobacco marketing
< Once/weekb
At least once/week	2.8	2.1, 3.6	1.5	1.1, 2.1

Note. CI = confidence interval; NS = not selected by stepwise selection method.

^aAdjusted OR controls for school differences and all other model variables simultaneously.

^bReference category.