title: [Prevalence of trachoma in rural primary school children in Tengzhou City of Shandong Province in China].
abstract: OBJECTIVE
  To investigate the prevalence of trachoma and its risk factors in rural primary school children in Tengzhou City of Shandong Province.
  
  
  METHODS
  In this cross-sectional population-based study, children aged 5 to 14 years old in primary school were randomly selected by a cluster sampling in which school shift was the sampling unit. Out of 2742 students, 2676 were eligible. The examination rate was 97.60%. All selected students were assessed for trachoma using the simplified grading scheme proposed by the World Health Organization (WHO). Statistical significance was calculated using Chi-square tests.
  
  
  RESULTS
  Out of 2676 eligible children, 593 cases of active trachoma were found, the prevalence of trachoma was 22.16% (95% CI:20.59%-23.73%). In 1606 boys, the prevalence of active trachoma was 19.74%, compared with 25.79% for girls. Girls were affected by active trachoma higher than boys (25.79% versus 19.74%, P=0.000). There was no significant difference among different age groups in term of the prevalence of trachoma (P=0.052). The prevalence of trachomatous follicle (TF), trachomatous inflammation (TI), and trachomatous scarring (TS) was 5.68% (152/2676), 19.21% (514/2676), 0.56% (15/2676), respectively. TI was more prevalent in girls than in boys (22.90% versus 16.75%, P=0.000).
  
  
  CONCLUSIONS
  Trachoma is still endemic in children of primary schools in Tengzhou rural areas. Some interventions including mass treatment with antibiotics, improvement of hygienic conditions, and improvement of primary eye care are needed.
authors.affiliation: Eye Center, Provincial Hospital Affiliated to Shandong University, Jinan 250021, China. wang_glasses@yahoo.com.cn
authors.forename: Li-hua
authors.initials: LH
authors.lastname: Wang
authors.forename: Bing
authors.initials: B
authors.lastname: Wang
authors.forename: Hao-yue
authors.initials: HY
authors.lastname: Wang
authors.forename: Wan-zhen
authors.initials: WZ
authors.lastname: Jiao
authors.forename: Cheng-chao
authors.initials: CC
authors.lastname: Zhou
authors.forename: Ting
authors.initials: T
authors.lastname: Wang
authors.forename: Ling-di
authors.initials: LD
authors.lastname: Yang
mesh_terms: D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D002681:China / Q000453:epidemiology; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008297:Male; D015995:Prevalence; D012307:Risk Factors; D012424:Rural Population; D013334:Students; D014141:Trachoma / Q000453:epidemiology*