Correlational finding on Happiness and subject: Healthy eating

StudyMujcic & Oswald (2016): study AU 2007
TitleEvolution of Well-Being and Happiness After Increases in Consumption of Fruit and Vegetables.
SourceAmerican Journal of Public Health, 2016, Vol 106, 1504 - 1510
URLhttps://www.ncbi.nlm.nih.gov/pubmed/27400354
DOIdoi: 10.2105/AJPH.2016.303260.
Public18+ aged general public, Australia, followed 3 years 2007-2009
SampleProbability multi-stage cluster sample
Non-Response
Respondents N =12385

Correlate
Author's labelWhat one eats
Page in Source table 1
Our classificationHealthy eating
Operationalization
a: Never eat red meat    
b: Never eat fish 
c: Drink low-fat or skim milk 
d: Avoid fatty foods)

Observed Relation with Happiness
Happiness
Measure
StatisticsElaboration/Remarks
O-SLW-u-sq-n-11-db-fix= ns
Never red meat     b-fix = +.20 CI95[.16,+.55]
Never fish         b-fix =+.09 CI05[.20,+.02]
Low-fat, skim milk b-fix = .04 CI95[.12,+.04]
Avoid fatty foods  b-fix = .05 CI95[.12,+.01]

b-fix controled for:
- CHANGE daily consumption of fruits and 
vegetables
- CURRENT
  - socio-demographics
    - age
    - income
    - education
    - marital status
    - employment
  - number of young children in household
  - exercise regularly
  - long-term health condition
  - BMI


Appendix 1: Happiness measures used
CodeFull Text
O-SLW-u-sq-n-11-dSelfreport on single question:

All things considered, how satisfied are you with your life?
Again, pick a number between 0 and 10 to indicate how satisfied you are.
0 totally dissatisfied
1
2
3
4
5
6
7
8
9
10 totally satisfied


Appendix 2: Statistics used
SymbolExplanation
b-fixREGRESSION COEFICIENT in fixed effects analysis
Type: test statistic
WDH symbol: b-fix
Primary correlate level: metric
Secondary correlate level: nonmetric
Happiness level: metric
Theoretical range: unlimited
Meaning:
Variant of usual (non-standardized) regression coefficient (b), which controls for the secondary variables, by focusing on differences from a fixed level, such as the mean in a category. Aims to reduce the residual variance and to improve the precision of the regression coefficient.

References:
Wikipedia: http://en.wikipedia.org/wiki/Fixed_effects_model
Non-technical text: http://www.jblumenstock.com/files/courses/econ174/FEModels.pdf
Source:
Ruut Veenhoven, World Database of Happiness, Collection of Correlational Findings, Erasmus University Rotterdam.
https://worlddatabaseofhappiness.eur.nl