01958nas a2200349   4500000000100000008004100001653001600042653001500058653001300073653001600086653001500102653001600117653001000133653001100143653001900154653003500173653002200208653000900230653002100239653001000260653001500270100001400285700001400299700001600313700001400329700001300343245013500356300001200491490000700503520108400510022001401594       2011                            d10aYoung Adult10aTrichiasis10aTrachoma10aSample Size10aPrevalence10aMiddle Aged10aKenya10aHumans10aHealth Surveys10aGeographic Information Systems10aAged, 80 and over10aAged10aAge Distribution10aAdult10aAdolescent1 aJefitha K1 aHillary R1 aMesurier RL1 aMwanthi M1 aKeeffe J00aWhat is the appropriate age range of individuals to be included in a survey to estimate the prevalence of trachomatous trichiasis?  a1058-600 v953 a<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>
  a1468-2079