title: [The relationship between within-day drinking occasion and intake amount of water of primary and middle school students in four cities of China].
abstract: OBJECTIVE
  To investigate the number of drinking occasions per day and average amount consumed per drinking occasion of primary and middle school students in four cities of China, and understand the relationship among drinking occasion, average amount consumed per drinking occasion and total drinking water.
  
  
  METHODS
  A total of 5914 primary and middle school students from Beijing, Shanghai, Guangzhou and Chengdu were selected using multiple-stage random sampling method, and 5868 students completed the study from September to October in 2011. The detailed information of amounts and types of daily drinking water was recorded by subjects using a 24 hours measurement for seven consecutive days. Analysis of the relationship among drinking occasion, average amount consumed per drinking occasion and total drinking water was carried out.
  
  
  RESULTS
  The daily total drinking water of subjects was (1089 ± 540) ml; the daily number of drinking occasions was (4.7 ± 1.8) times, with 79.1% (4639/5868) of subjects reporting 6 or less drinking occasions. The amount consumed per drinking occasion was (239 ± 96) ml, plain water (231 ± 112) ml, and beverages (237 ± 112) ml. The number of drinking occasions of subjects was positively correlated with total drinking water (r = 0.614, P < 0.05), and negatively correlated with the average amount consumed per drinking occasion (r = -0.211, P < 0.05). Total drinking water and the average amount consumed per drinking occasion was positively correlated (r = 0.598, P < 0.05).
  
  
  CONCLUSIONS
  The number of drinking occasion of primary and middle school students more than 6 times was fewer in four cities of China, but the average amount of beverages consumed per drinking occasion was relatively more. With the increasing of drinking occasion, the average amount consumed per drinking occasion decreased, but total drinking water increased.
authors.affiliation: Institute for Nutrition and Food Safety, Chinese Center for Disease Control and Prevention, Beijing 100050, China.
authors.forename: Xiao-jun
authors.initials: XJ
authors.lastname: Wang
authors.forename: Xiao-qi
authors.initials: XQ
authors.lastname: Hu
authors.forename: Song-ming
authors.initials: SM
authors.lastname: DU
authors.forename: Hui
authors.initials: H
authors.lastname: Pan
authors.forename: Qian
authors.initials: Q
authors.lastname: Zhang
authors.forename: Le
authors.initials: L
authors.lastname: Yan
authors.forename: Zheng-yuan
authors.initials: ZY
authors.lastname: Wang
authors.forename: Shao-ping
authors.initials: SP
authors.lastname: Nie
authors.forename: Jian-bo
authors.initials: JB
authors.lastname: Yang
authors.forename: Guan-sheng
authors.initials: GS
authors.lastname: Ma
mesh_terms: D000293:Adolescent; D001628:Beverages; D002648:Child; D002681:China; D004034:Diet Surveys; D004326:Drinking; D060766:Drinking Water; D005260:Female; D006801:Humans; D008297:Male; D013334:Students; D011795:Surveys and Questionnaires; D014505:Urban Population
chemical_list: D060766:Drinking Water