Correlational finding on Happiness and subject: What one eats

StudyConner et al. (2015): study NZ Auckland 2013
TitleOn Carrots and Curiosity: Eating Fruit and Vegetables is associated with greater Flourishing in daily Life.
SourceBritish Journal of Health Psychology , 2015, Vol. 20, 413 - 444 .
DOIdoi: 10.1111/bjhp.12113
PublicUniversity students, New Zealand, 2013, followed 13 days
SampleNon-probability chunk sample
Respondents N =405

Author's labelconsumption of vegetables
Our classificationWhat one eats
Self report in diary of the number of servings eaten 
that days of  vegetables: 
- fresh, frozen, canned 
- excluding juice and chips
Observed distributionRange: 0-4; M = 1,27; SD = 0,75
Standatd questions in the New Zealand National 
Nutrition Survey 1997 (NNS'97)

Observed Relation with Happiness
A-AB-md-mqr-v-5-br=+ s
BETWEEN persons association between average daily 
vegetables consumption and average mood
PA: r = +.11 (05)
NA: r = +.00 (ns)

Affect Balance not reported, but will be positive
A-AB-md-mqr-v-5-br=+ s
WITHIN person association between vegetables 
consumption and mood during the day:
PA: r = +.04 (001)
NA: r = -.02 (05)

Affect Balance not reported, but will be positive 
and significant

Appendix 1: Happiness measures used
CodeFull Text
A-AB-md-mqr-v-5-bSelfreport on 19 questions repeated 13 days

To what extent did you feel today,,
A calm
B cheerful
C pleasant
D energetic
E enthusiastic
F excited
G sad
H dejected
I depressed
J nervous
K anxious
L tense
O angry
P irritable
Q hostile

1 not at all
5 extremely

Computation: (A to F) - (G toQ)

Appendix 2: Statistics used
rPRODUCT-MOMENT CORRELATION COEFFICIENT (Also "Pearson's correlation coefficient' or simply 'correlation coefficient')
Type: test statistic.
Measurement level: Correlate: metric, Happiness: metric
Range: [-1; +1]

r = 0 no correlation ,
r = 1 perfect correlation, where high correlate values correspond with high happiness values, and
r = -1 perfect correlation, where high correlate values correspond with low happiness values.
Ruut Veenhoven, World Database of Happiness, Collection of Correlational Findings, Erasmus University Rotterdam.