title: [A study on factors contributing to intelligence in 857 children].
abstract: OBJECTIVE
  To study the main environmental factors affecting intelligence of children.
  
  
  METHODS
  Intelligence quotients (IQ) were examined in 857 pupils of grades 1 to 6 in a primary school and categorized into four different classes. Data of relevant environmental factors were collected with questionnaires. Uni-variate and multivariate logistic regression analyses were performed to identify the factors influencing their IQ.
  
  
  RESULTS
  There were 27 factors with statistical significance in uni-variable analysis. And, then they were analyzed with stepwise logistic regression method. Six variables, i.e., parents' education level, breast feeding during infancy, early education at home, nutritional status before three years old, single parent family and average scores at school, enter the regression model finally.
  
  
  CONCLUSIONS
  Intelligence development in children was affected by a lot of factors, and good acquired environmental factors, especially their early nutrition, family background and education, would benefit for their intelligent development and improvement of their intelligent ability in children.
authors.affiliation: Department of Public Health, Nantong Medical College, Nantong, Jiangsu 226001.
authors.forename: P
authors.initials: P
authors.lastname: Chen
authors.forename: F
authors.initials: F
authors.lastname: Chen
mesh_terms: D002648:Child; D002657:Child Development; D004493:Education; D004777:Environment; D005163:Factor Analysis, Statistical; D005260:Female; D006801:Humans; D007360:Intelligence / Q000502:physiology; D007361:Intelligence Tests; D016015:Logistic Models; D008297:Male; D015999:Multivariate Analysis; D009752:Nutritional Status; D011795:Surveys and Questionnaires