1. Volume 382, Issue 9907, Pages 1795-1806 (November 2013)
Prevalence, risk factors, and uptake of interventions for sexually transmitted infections in Britain: findings from the National Surveys of Sexual Attitudes and Lifestyles (Natsal) 
Dr Pam Sonnenberg, PhD, Soazig Clifton, BSc, Simon Beddows, PhD, Nigel Field, MBPhD, Kate Soldan, PhD, Clare Tanton, PhD, Catherine H Mercer, PhD, Filomeno Coelho da Silva, BSc, Sarah Alexander, PhD, Andrew J Copas, PhD, Andrew Phelps, BA, Bob Erens, MA, Philip Prah, MSc, Wendy Macdowall, MSc, Prof Kaye Wellings, FRCOG, Prof Catherine A Ison, PhD, Prof Anne M Johnson, MD 
The Lancet 
Volume 382, Issue 9907, Pages (November 2013)
DOI: /S (13)
Copyright © 2013 Sonnenberg et al. Open Access article distributed under the terms of CC BY Terms and Conditions

2. Figure 1
Change over time in reported HIV testing in the past 5 years, by number of sexual partners (A, B) and target group (C, D)
Denominator is individuals aged 16–44 years who reported at least one sexual partner over the lifetime. The appendix shows the proportions, 95% CIs, and p values for the difference between Natsal-3 and Natsal-2.
The Lancet  , DOI: ( /S (13) )
Copyright © 2013 Sonnenberg et al. Open Access article distributed under the terms of CC BY Terms and Conditions

3. Figure 2
Change over time in reported attendance at sexual health clinics in the past 5 years, by age group (A, B) and number of partners (C, D)
Denominator is individuals aged 16–44 years who reported at least one sexual partner over the lifetime. The appendix shows the proportions, 95% CIs, and p values for the difference between Natsal-3 and Natsal-2.
The Lancet  , DOI: ( /S (13) )
Copyright © 2013 Sonnenberg et al. Open Access article distributed under the terms of CC BY Terms and Conditions