title: A novel subjective sleep assessment tool for healthy elementary school children in Japan.
abstract: BACKGROUND
  A child's sleep pattern is important in defining his or her mental and physical well-being. Although we have reported previously on the utility of collecting 2 weeks of daily sleep logs, this type of record keeping is often onerous for the parents. Therefore, we established a new questionnaire, called the Japan Children's Study Sleep Questionnaire (JCSSQ), which is used to collect sleep pattern data over 4 weeks, including weekdays, Saturdays, Sundays, and holidays.
  
  
  METHODS
  Two parent-administered sleep assessment tools, the JCSSQ and a daily sleep log, were used to examine the sleeping patterns of 105 school children (58 boys and 47 girls; age range, 6-12 years) in Fukuoka, Japan. Parents were requested to record sleep logs for 14 days after the JCSSQ. Sleep/wake status was recorded on the sleep log, from which data on the parameters of "sleep onset time", "waking time", "sleep period", and "number of nights waking" were extracted.
  
  
  RESULTS
  There were no significant differences between the JCSSQ and the logs for waking time data collected on weekdays, Saturdays, and Sundays. However, there was a significant difference (P = 0.03) between the JCSSQ and the sleep logs with respect to the sleep onset time data collected on Saturdays.
  
  
  CONCLUSIONS
  The JCSSQ was easy to fill out, and the data collected using the JCSSQ on weekdays were both valid and generally consistent with those collected using sleep logs. However, for sampling on Saturdays and Sundays, the JCSSQ data did not correlate with the sleep log data.
authors.affiliation: Japan Children's Study Group, Research Institute of Science and Technology for Society, Japan Science and Technology Agency, Tokyo, Japan.
authors.forename: Mizue
authors.initials: M
authors.lastname: Iwasaki
authors.forename: Akiko
authors.initials: A
authors.lastname: Iemura
authors.forename: Tetsuji
authors.initials: T
authors.lastname: Oyama
authors.forename: Toyojiro
authors.initials: T
authors.lastname: Matsuishi
mesh_terms: D002648:Child; D015331:Cohort Studies; D003625:Data Collection / Q000379:methods*; D005260:Female; D006801:Humans; D007564:Japan; D008297:Male; D010287:Parent-Child Relations; D015203:Reproducibility of Results; D012890:Sleep; D011795:Surveys and Questionnaires; D013997:Time Factors; D014851:Wakefulness