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STD-1.1 Data Details

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STD-1.1 Reduce the proportion of females aged 15 to 24 years with Chlamydia trachomatis infections attending family planning clinics

About the Data

Description of the data source, numerator, denominator, survey questions, and other relevant details about the national estimate.

Data Source: 
STD Surveillance System
Changed Since the Healthy People 2020 Launch: 
Baseline (Year): 
8.0 (2015)
Target-Setting Method: 
10 percent improvement

Number of positive tests among women aged 15 to 24 years who attended family planning clinics in the past 12 months


Number tests administered (unsatisfactory tests, indeterminate or inconclusive results, or inadequate specimens are excluded) among women aged 15 to 24 years who attended family planning clinics in the past 12 months

Comparable Healthy People 2010 Objective: 
Retained from HP2010 objective
Data Collection Frequency: 
Methodology Notes: 

    Using visit-level data from women attending selected family planning/reproductive health clinics, annual chlamydia positivity among women aged 15-24 years who tested positive for chlamydia at least once in a given year among all women tested for chlamydia at least once in the same year were estimated.

    Chlamydia is usually asymptomatic. Consequently, in clinics with low screening coverage (suggesting they are primarily testing symptomatic, high-risk women) positivity will overestimate clinic prevalence. To minimize this possible bias, clinics were restricted to those that 1) reported data for at least 100 women aged 15-24 years in a given year and 2) documented that greater than 60% of women aged 15-24 years were tested for chlamydia in the same year. Additionally, as clinics participating in this surveillance system have varying volume, a simple aggregate estimate of positivity (i.e., numerator and denominator summed across all clinics) will be biased towards high-volume clinics. To address this bias, positivity for each clinic was calculated and then the mean positivity across all clinics was estimated.

Revision History

Any change to the objective text, baseline, target, target-setting method or data source since the Healthy People 2020 launch.

Description of Changes Since the Healthy People 2020 Launch: 
In 2019, the baseline year was revised from 2008 to 2015. The (new) 2015 baseline value is 8.0%. The new target using the current target-setting method of 10% improvement is 7.2%. The baseline year and value were revised due to a change in methodology for further information please see the methodology section of the data details.


Additional resources about the objective

  1. Centers for Disease Control and Prevention (CDC). Case definitions for infectious conditions under public health surveillance. Morbidity and Mortality Weekly Report 46 (RR-10): 1997.