title: [Investigation and analysis on correlative factors of sleeping time in 2k12 year-old children in Changsha].
abstract: OBJECTIVE
  To study the sleeping time and its correlative factors in 2k12 year-old children in Changsha.
  
  
  METHODS
  A cluster sample with 3 756 children was randomly selected from Changsha, whose parents or care persons were interviewed with questionnaires about children's sleeping status from June 2006 to April 2007 by trained medical staff. One person was responsible for a questionnaire for one child.
  
  
  RESULTS
  Two to twelve year-old children slept 10.60 hours a day. The average sleeping time every day was 12.26, 11.57, 11.33, 11.26, 10.95, 10.64, 10.62, 10.45, 10.28, 9.83, and 9.61 hours from 2 to 12 year-old children. The sleeping time in one day in each age group was different obviously but the same for boys and girls. The main factors that affected the sleeping time of children were: child's age, having pets or not, child's fixed pattern of sleeping time, methods of falling asleep, diet regulation, asthma, the mother's age, number of child delivery of mother, and mother's sleeping time.
  
  
  CONCLUSIONS
  Sleeping time in a day decreases with the age increase in 2k12 year-old children. Many factors affected sleeping time of children, including the child's age, habits and environmental factors, diets, diseases, and mothers' conditions.
authors.affiliation: Nursing Department, Second Xiangya Hospital,Central South University, Changsha 410011, China. caiyimin88@yahoo.com.cn
authors.forename: Yi-min
authors.initials: YM
authors.lastname: Cai
authors.forename: Zhu-wen
authors.initials: ZW
authors.lastname: Yi
authors.forename: Hui
authors.initials: H
authors.lastname: Huang
authors.forename: Jie-min
authors.initials: JM
authors.lastname: Li
authors.forename: Shi-hui
authors.initials: SH
authors.lastname: Ou
authors.forename: Min
authors.initials: M
authors.lastname: Zhang
mesh_terms: D002648:Child; D002675:Child, Preschool; D002681:China; D005260:Female; D006184:Habits; D006801:Humans; D008297:Male; D009034:Mother-Child Relations; D012890:Sleep; D011795:Surveys and Questionnaires; D013995:Time