Study Chen et al. (2005): study JP 1999
- Public
- 9-10 aged children followed 3 years, Japan 1999-2002
- Survey name
- JP-Toyama Birth Cohort Study
- Sample
- Respondents
- N = 7794
- Non Response
- 14,4%
- Assessment
- Questionnaire: Paper & Pencil Interview (PAPI)
Correlate
- Authors's Label
- Bedtime
- Our Classification
-
-
- Error Estimates
- T1-T2 correspondence r=+,24
- Remarks
- Assessed at T1 and T2 with 3 year difference
- Distribution
- N= 4:5713(73,3)%; 3: 1465(18,8)%; 2:514(6,6)% ;1:102 (1,3)%
- Operationalization
- Self report on question on Bedtime:
4: <10 PM (early)
3: 10-10,5 PM
2: 10,5-11PM
1: ≥11PM (late)
Observed Relation with Happiness
vs 10-10,5 PM OR = 1,11 CI95[0,99-1,25]
vs 10,5-11PM OR = 1,19 CI95[0,98-1,43]
vs ≥11PM OR = 1.28 CI95[0,86-1,92]
OR no controls
vs 10,5-11PM OR = 1,17 CI95[0,96-1,42]
vs ≥11PM OR = 1,34 CI95[0,88-2,05]
OR controlled for
- age
- sexe
- T1 BMI
T1 bedtime % happy % unhappy difference
- <10PM 42,4 57,6 -15,2
- 10-10,5 39,9 60,1 -20,2
- 10,5-11PM 38,4 61,6 -23,2
- ≥11PM 36,5 63,5 -27
%happy %unhappy difference
- Remained<10PM 49,0 51,0 -2
- <10PMto≥10PM 40,5 59,5 -19
- ≥10PMto<10PM 48,5 51,5 -3
- remined ≥10PM 38,3 61,7 -23,4
Remained <10PM
vs <10PM to≥10PM OR = 1,41 CI95[1,25-1,60]
vs ≥10PM to<10PM OR = 1,02 CI95[0,76-1,38]
vs remained ≥10PM OR = 1,55 CI95[1,34-1,78]
OR not controlled
Remained <10PM
vs <10PM to≥10PM OR = 1,41 CI95[1,24-1,61]
vs ≥10PM to<10PM OR = 1,07 CI95[0,78-1,47]
vs remained ≥10PM OR = 1,55 CI95[1,34-1,80]
OR controlled for
- age
- sexe
- T1 BMI
Remained <10PM
vs <10PM to≥10PM OR = 1,29 CI95[1,11-1,49]
vs ≥10PM to<10PM OR = 0,97 CI95[0,68-1,38]
vs remaind ≥10PM OR = 1,41 CI95[1,19-1,66]
OR controled for
- age
- sexe
- T1 BMI
- Preference for physical activity
- Frequency of physical activity
- Televisoon viewing
- breakfast eating
- Sleep duration
- video gameplaying
T1-T2 difference: 3 years