24.01.2013 Views

Rob van Hest Capture-recapture Methods in Surveillance - RePub ...

Rob van Hest Capture-recapture Methods in Surveillance - RePub ...

Rob van Hest Capture-recapture Methods in Surveillance - RePub ...

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

Chapter 9<br />

Abstract<br />

Truncated models are <strong>in</strong>direct methods to estimate the size of a hidden population which,<br />

<strong>in</strong> contrast to the capture-<strong>recapture</strong> method, can be used on a s<strong>in</strong>gle <strong>in</strong>formation source.<br />

We estimated the coverage of a tuberculosis screen<strong>in</strong>g programme among illicit drug<br />

users and homeless persons with a mobile digital X-ray unit between 1 January 2003 and<br />

31 December 2005 <strong>in</strong> Rotterdam, the Netherlands, us<strong>in</strong>g truncated models. The screen<strong>in</strong>g<br />

programme reached approximately two-third of the estimated target population at least<br />

once yearly. The <strong>in</strong>tended coverage (at least two chest X-rays per person per year) was<br />

approximately 23%. We conclude that simple truncated models can be used relatively<br />

easily on available s<strong>in</strong>gle source rout<strong>in</strong>e data to estimate the size of a population of illicit<br />

drug users and homeless persons. We assume the most likely overall bias <strong>in</strong> this study to<br />

be overestimation and therefore the coverage of the targeted mobile tuberculosis<br />

screen<strong>in</strong>g programme would be higher.<br />

126

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!