Sociodemographic characteristics of Baltimore survey respondents providing specimens for chlamydial testing in 1997–98 and 2006–2009.

Notes: Results for adults ages 18 to 35 from the Baltimore STD and Behavior Survey (BSBS) and the Monitoring STIs Survey Program (MSSP). Table shows unweighted base Ns for percentages and weighted estimates of the percentage of the survey respondents with sociodemographic characteristic. Weighted estimates account for differing probabilities of selection and post-stratification adjustment to match Census marginal for Baltimore, Maryland. 95% confidence intervals (CI) were calculated using statistical algorithms that take account of the complex sample designs of the surveys. Table excludes all respondents who were missing a chlamydia test result.(a) The BSBS survey was conducted between January 1997 and September 1998.(b) The MSSP survey was conducted between September 2006 and June 2009. Mailed urine specimens were received by the laboratory through August 2009.(c) Persons who identified themselves as Hispanic are classified as Non-Black for both BSBS and MSSP analyses. This differs from our previous analysis of the BSBS in which persons were assigned to their chosen racial category; Hispanic origin was ignored. Of the 20 BSBS respondents who claimed Hispanic origin, 11 identified their race as “Other” and 2 selected “American Indian or Alaskan Native” as their racial category.