Table 5.

Covariate-adjusted odds ratios estimated from conditional logistic regression for SES in relation to recently active (past month) drug use, with classroom-level matching. Data from private school survey, Sao Paulo, Brazil, 2008.

Recently active	SES	A1	A2	B1	B2	CDE
Use of Lanca	OR	ref	0.9	0.6	0.4	0.2
	95% CI		0.4, 1.8	0.3, 1.3	0.2, 1.1	0.1, 0.8
	p		0.60	0.10	0.07	0.03
Use of Inhalant Drugs Other than Lanca	OR	ref	0.9	1.2	1.0	1.3
	95% CI		0.4, 2.0	0.5, 3.0	0.3, 3.0	0.3, 5.7
	p		0.7	0.6	0.9	0.7
Drinking of Alcoholic Beverages	OR	ref	0.8	0.6	0.5	0.5
	95% CI		0.6, 1.01	0.4, 0.8	0.4, 0.7	0.4, 0.8
	p		0.060	<0.001	<0.001	<0.001
Smoking of Tobacco	OR	ref	0.6	0.5	0.3	0.4
	95% CI		0.5, 0.9	0.3, 0.7	0.2, 0.5	0.2, 0.7
	p		0.006	<0.001	<0.001	0.002
Use of Internationally Regulated Drugs IRD	OR	ref	0.7	0.4	0.4	0.3
	95% CI		0.5, 0.9	0.3, 0.6	0.3, 0.7	0.1, 0.5
	p		0.030	<0.001	0.001	<0.001

SES = social rank according to ABEP classification

OR = odds ratio estimate from conditional form of logistic regression, with age and sex as covariates in the model, where ‘ref’ indicates that the highest social rank served as the reference category for estimation of the odds ratios.

CI = confidence interval

p = p-value under the null hypothesis of no association between SES and drug use occurrence as studied here.