A Cluster of Ocular Syphilis Cases — Seattle, Washington, and San Francisco, California, 2014–2015

Abbreviation: CI = confidence interval.* Used cigarettes or cigars on one or more days, but did not use marijuana during the 30 days preceding the surveys.† Used marijuana one or more times, but did not use cigarettes or cigars during the 30 days preceding the surveys.§ Used cigarettes or cigars on one or more days, or used marijuana one or more times during the 30 days preceding the surveys.¶ Students with missing data for cigarette use, cigar use, marijuana use, or sex and students who did not self-identify as non-Hispanic black, non-Hispanic white, or Hispanic were excluded from the analysis.** Significant linear trend during 1997-2013 (p<0.01).† † Significant quadratic trend during 1997-2013 (p<0.01).