@article{28586,
  keywords = {Young Adult, Trichiasis, Trachoma, Sample Size, Prevalence, Middle Aged, Kenya, Humans, Health Surveys, Geographic Information Systems, Aged, 80 and over, Aged, Age Distribution, Adult, Adolescent},
  author = {Jefitha K and Hillary R and Mesurier RL and Mwanthi M and Keeffe J},
  title = {What is the appropriate age range of individuals to be included in a survey to estimate the prevalence of trachomatous trichiasis?},
  abstract = {<p><strong>INTRODUCTION: </strong>A survey to determine the prevalence of trachomatous trichiasis (TT) requires a large sample size and the recommended participant age is ≥15 years. This study sought to establish the appropriate age range of individuals to be included in TT surveys.</p>

<p><strong>METHODS: </strong>Data from six previous surveys of adults ≥15 years old were reanalysed.</p>

<p><strong>RESULTS: </strong>Reanalysis indicated that 69.6-93.3% (average 87.0%) of untreated TT occurred in those aged 40+ years and 52.2-86.7% (average 73.1%) in those aged 50+ years (age ≥50 years is used in rapid assessment of avoidable blindness). Age ≥40 years was adopted in a TT survey conducted in Turkana district because it allowed a smaller sample size than age ≥15 years.</p>

<p><strong>CONCLUSIONS: </strong>The estimated backlog of untreated TT in people aged ≥40 years old in Turkana was 5932 and the overall TT backlog was likely to be 6358-8523. These findings cannot be generalised because all surveys were carried out in the same country.</p>
},
  year = {2011},
  journal = {The British journal of ophthalmology},
  volume = {95},
  pages = {1058-60},
  issn = {1468-2079},
  doi = {10.1136/bjo.2010.193268},
  language = {eng},
}