What is the appropriate age range of individuals to be included in a survey to estimate the prevalence of trachomatous trichiasis?

Citation:
Karimurio J, Rono H, Richard L, Mutuku M, Keeffe J. "What is the appropriate age range of individuals to be included in a survey to estimate the prevalence of trachomatous trichiasis?" Br J Ophthalmol. 2011;95:1058-1060.

Abstract:

Introduction: 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.
Methods: Data from six previous surveys of adults >15 years old were reanalysed.
Results: Reanalysis indicated that 69.6-93.3% (average
87.0%) of untreated TT occurred in those aged 40+ years and 52.2e86.7% (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.
Conclusions: 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.

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