# Correlational findings

## 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
Video game playing
Our Classification
Error Estimates
T1-T2 correspondence r=+,13
Remarks
Assessed at T1 and T2 with 3 year difference
Distribution
N= 1:3460(44,4)%;  2: 904 (11,6)%; 3:2167(27,8)% ;4:1263 (16,2)%
Operationalization
Self report on question on hours Video game playing:
1:<1 h,<1 h
2:<1 h,≥1 h
3:=<1 h,<1 h
4:≥1 h,≥1 h

## Observed Relation with Happiness

Happiness Measure Statistics Elaboration / Remarks O-QOL-cm-sq-v-5-a = - T1-T2 CHANGE hours gaming by T2 happiness
%happy  %unhappy difference
- remained <1h      42,1     57,9     -15,8
- <1h to ≥1h        41,8     58,2     -16,4
- =<1h to <1h       42,5     57,5      -15
- remained ≥1 h     39,4     60,6      -21,2
O-QOL-cm-sq-v-5-a = +/- p < .05 T1-T2 CHANGE hours gaming by T2 happiness

Remained <1h
vs <1h to ≥1h       OR=1,01 CI95[0,86-1,11]
vs <1h to <1h       OR=0,95 CI95[0,84-1,06]
vs remained ≥1 h    OR=1,18 CI95[1,02-1,36]
OR not controlled
O-QOL-cm-sq-v-5-a = - p < .05 T1-T2 CHANGE hours gaming by T2 happiness

Remained <1h
vs <1h to ≥1h        OR=1,03 CI95[0,88-1,22]
vs =<1h to <1h       OR=1,07 CI95[0,94-1,22]
vs remained ≥1 h     OR=1,37 CI95[1,17-1,61]
OR controlled for
- age
- sexe
- T1 BMI
O-QOL-cm-sq-v-5-a = +/- p < .05 T1-T2 CHANGE hours gaming by T2 happiness

Remained <1h
vs <1h to ≥1h        OR=0,97 CI95[0,81-1,16]
vs =<1h to <1h       OR=1,07 CI95[0,94-1,23]
vs remained ≥1 h     OR=1,24 CI95[1,04-1,47]
OR controlled for
- age
- sexe
- T1 BMI
- Preference for physical activity
- Frequency of physical activity
- Television viewing
- Bedtime
- Sleep duration

T1-t2 difference: 3 years