Correlational finding on Happiness and What one eats
Subject code: N15ab04

StudyFeller et al. (2013): study DE 1994
TitleLife Satisfaction and Risk of Chronic Diseases in the European Prospective Investigation into Cancer and Nutrition {EPIC)-Germany.
SourcePLoS ONE 8(8): e73462
URLhttp://journals.plos.org/plosone/article?id=10.1371/journal.pone.0073462
DOIdoi:10.1371/joumal.pone.0073462
Public35-65 aged, general population, Germany, followed 4 years1994-2008
SampleProbability multistage stratified area sample
Non-Response
Respondents N =48976

Correlate
Author's labelConsumption of whole grain bread (g/day)
Page in Source 4
Our classificationWhat one eats, code N15ab04
Operationalization
Whole grain bread consumption  p.p. in grams/day based 
on selfreport of diet

Observed Relation with Happiness
Happiness
Measure
StatisticsElaboration/Remarks
O-SLW-g-sq-v-4-bD%=+
T1 happiness by T1 whole grain bread consumption

                   g/day   SD 
Very satisfied      48     55      
Rather satisfied    46     55
Unsatisfied         44     57


Appendix 1: Happiness measures used
CodeFull Text
O-SLW-g-sq-v-4-bSelfreport on single question:

Please tell me how satisfied you are with your life overall. Would you say that you are..
4 very satisfied
3 mostly satisfied
2 mostly dissatisfied
1 very dissatisfied
- don't know


Appendix 2: Statistics used
SymbolExplanation
D%DIFFERENCE in PERCENTAGES
Type: descriptive statistic only.
Measurement level: Correlate level: dichotomous, but nominal or ordinal theoretically possible as well. Happiness level: dichotomous
Range: [-100; +100]

Meaning: the difference of the percentages happy people at two correlate levels.
Source:
Ruut Veenhoven, World Database of Happiness, Collection of Correlational Findings, Erasmus University Rotterdam.
https://worlddatabaseofhappiness.eur.nl