1. Volume 378, Issue 9787, Pages 247-255 (July 2011)
Effect of concurrent sexual partnerships on rate of new HIV infections in a high- prevalence, rural South African population: a cohort study 
Dr Frank Tanser, PhD, Till Bärnighausen, MD, Lauren Hund, AM, Prof Geoffrey P Garnett, PhD, Nuala McGrath, ScD, Prof Marie-Louise Newell, PhD 
The Lancet 
Volume 378, Issue 9787, Pages (July 2011)
DOI: /S (11)
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2. Figure 1
Two-dimensional standard Gaussian kernel of search radius 3 km used to map geographical variations in mean lifetime partners and point-prevalence of concurrency in sexually active men across the surveillance area
The Z axis shows the weights given to each cell. The greater the distance from the centre of the kernel, the lower the weight assigned to that cell in the community-level calculation.
The Lancet  , DOI: ( /S (11) )
Copyright © 2011 Elsevier Ltd Terms and Conditions

3. Figure 2
Age-standardised geographical variations in mean lifetime partners (A) and point-prevalence of concurrency (B) in sexually active men across the surveillance area
Obtained by a standard Gaussian kernel of radius 3 km (main roads are superimposed). The Z axis is proportional to the value of the community-level sexual behaviour covariate for any given geographical location.
The Lancet  , DOI: ( /S (11) )
Copyright © 2011 Elsevier Ltd Terms and Conditions

4. Figure 3
A comparison of female age-standardised HIV incidence by mean lifetime partners and point-prevalence of concurrency among sexually active men in the surrounding local community (as shown in figure 2)
Error bars show 95% CIs.
The Lancet  , DOI: ( /S (11) )
Copyright © 2011 Elsevier Ltd Terms and Conditions