Abstract: Abstract: Objective   To investigate the related factors affecting pinworm infection in kindergarten children in Baota District of Yan'an City for scientific evidence in prevention and treatment of the infection in children in this area. Methods   By random cluster sampling method, one kindergarten was randomly included from the five areas (determined by geographical location, i.e., the east, west, south, north and middle) of Baota District. All children in the sampled kindergarten underwent examination with the adhesive cellaphane-tape perianal swab method, and the factors affecting infections were analyzed via questionnaire survey on the personal hygiene habits of children, educational background and working conditions of their parents, and living conditions of the children. Results   A total of 1 166 children were examined, in whom positive results were identified in 32. The total infection rate of pinworm was 2.74%. The infection rate was 2.49% (14/562) and 2.98% (18/604), respectively for boys and girls, and the difference was insignificant (χ²=0.261, P>0.05). Infection rate was 3.24% (30/926) and 0.83% (2/240) for public kindergarten and private kindergarten, 0.52% (2/388), 2.56% (10/390) and 5.15% (20/388) for children in junior, middle and senior kindergarten, 1.32% (12/910), 4.20% (10/238) and 55.56% (10/18) for children with better, good or poor personal hygiene, and 1.85% (8/432), 2.69% (18/670) and 9.38% (6/64) for the children whose parents had secondary technical school education or above and stable job, parents had under secondary technical school education and stable job and parents had education under secondary technical school and unstable job, respectively. The infection rate was 0.89% (8/898), 4.20% (10/238) and 46.67% (14/30) respectively for children living in building of more stories, single-story building and cave-dwelling, and statistically varied in children in different kindergartens, grades, hygiene habits, parents' working conditions and living conditions (χ²=4.135, 15.629, 77.022, 11.840, 230.285, respectively, all P<0.05). Conclusion   Infection with pinworm in kindergarten children in Baota District of Yan'an City was declined in 2021 compared to previous years, and the infection rate is associated with the grade of children, type of kindergarten, personal hygiene habits, parents' educational level and work and living conditions. 

Key words: Pinworm, Sampling Survey, Children, Kindergarten, Baota District