Lower quartile of posterior distribution of predicted prevalence of active trachoma in children aged 1–9 years, Southern Sudan, 2001–2009.

<p>Lower quartile of posterior distribution of predicted prevalence of active trachoma in children aged 1–9 years, Southern Sudan, 2001–2009.</p

Upper quartile of posterior distribution of predicted prevalence of active trachoma in children aged 1–9 years, Southern Sudan, 2001–2009.

<p>Upper quartile of posterior distribution of predicted prevalence of active trachoma in children aged 1–9 years, Southern Sudan, 2001–2009.</p

Spatially structured residual variation in prevalence of active trachoma in children aged 1–9 years, Southern Sudan, 2001–2009, after accounting for rainfall, land cover and age and sex of survey participants.

<p>Estimates were derived using a geostatistical random effect.</p

Map showing LF endemic, non-endemic and unmapped areas of South Sudan.

<p>Map showing LF endemic, non-endemic and unmapped areas of South Sudan.</p

Observed prevalence of active trachoma using data from population-based prevalence surveys, in children aged 1–9 years, Southern Sudan, 2001–2009.

<p>Observed prevalence of active trachoma using data from population-based prevalence surveys, in children aged 1–9 years, Southern Sudan, 2001–2009.</p

Semivariograms related to risk mapping models for active trachoma in children aged 1–9 years, Southern Sudan, 2001–2009.

<p>A) raw data and Person's residuals of: B) model 1; and C) model 2. Models 1 and 2 refer to the models presented in <a href="http://www.plosntds.org/article/info:doi/10.1371/journal.pntd.0000799#pntd-0000799-t001" target="_blank">Table 1</a>.</p

Predicted probability that prevalence of active trachoma is >10% in children aged 1–9 years, Southern Sudan, 2001–2009.

<p>Estimates were obtained from posterior predictive distributions derived using model-based geostatistics.</p

Prevalence of Trachoma Signs.

<p>Data are presented on percentage scale.</p><p>TF = trachomatous inflammation - follicular, TI = trachomatous inflammation, AT = active trachoma (TF and, or TI), TS = trachomatous scarring, TT = trachomatous trichiasis, CO = corneal opacity.</p>a<p>exact binomial confidence interval.</p>b<p>adjusted for age, sex, county, between-village variation and between-household variation using random effects regression models; adjusted estimates not obtained where prevalence very low (≤4%).</p

The median of the posterior distribution for predicted prevalence of active trachoma in children aged 1–9 years, Southern Sudan, 2001–2009.

<p>The median of the posterior distribution for predicted prevalence of active trachoma in children aged 1–9 years, Southern Sudan, 2001–2009.</p

Results from sampling simulations in Unity State.

<p>Sampling simulations were repeated 1000 times, assuming 500 children were enrolled in each cluster (village) and 50 children sampled from each cluster.</p