Volume 378, Issue 9787, Pages (July 2011)

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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 247-255 (July 2011) DOI: 10.1016/S0140-6736(11)60779-4 Copyright © 2011 Elsevier Ltd Terms and Conditions

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 2011 378, 247-255DOI: (10.1016/S0140-6736(11)60779-4) Copyright © 2011 Elsevier Ltd Terms and Conditions

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 2011 378, 247-255DOI: (10.1016/S0140-6736(11)60779-4) Copyright © 2011 Elsevier Ltd Terms and Conditions

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 2011 378, 247-255DOI: (10.1016/S0140-6736(11)60779-4) Copyright © 2011 Elsevier Ltd Terms and Conditions