Correlational finding on Happiness and subject: Degree of restriction

StudyWu et al. (2014): study TW 2009
TitleOn the Predictive Effect of Multidimensional Importance-Weighted Quality of Life Scores on Overall Subjective Well-Being.
SourceSocial Indicators Research, 2014, 115, 933 - 943
URLhttp://link.springer.com/article/10.1007%2Fs11205-013-0242-x
DOIDOI: 10.1007/s11205-013-0242-x
PublicStudents, Taiwan, 200?
SampleNon-probability chunk sample
Non-Response
Respondents N =146

Correlate
Author's labelPain
Page in Source 937.939
Our classificationDegree of restriction
Operationalization
The following questions ask about how much you have 
experienced certain things in the last four weeks:
To what extent do you feel that physical pain prevents 
you from doing what you need to do? 
1  to an extreme amount
2  very much
3  to a moderate amount
4  a little
5  not at all

Pain also rated for importance
Observed distributionMean: 3.52: SD=.84
Remarks
Full questions not reported in this paper. Question on 
pain taken from WHOQOL-Bref. Question on importance 
figured in the full WHOQOL questionnaire.

Observed Relation with Happiness
Happiness
Measure
StatisticsElaboration/Remarks
O-QOL-c-sq-v-5-br=+.05 ns
raw score
O-QOL-c-sq-v-5-br=-.08 ns
score weighted by perceived importance


Appendix 1: Happiness measures used
CodeFull Text
O-QOL-c-sq-v-5-bSelfreport on single question:

How do you feel about your life just now?
5 excellent
4 good
3 neither good nor bad
2 bad
1 very bad


Appendix 2: Statistics used
SymbolExplanation
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]

Meaning:
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.
Source:
Ruut Veenhoven, World Database of Happiness, Collection of Correlational Findings, Erasmus University Rotterdam.
https://worlddatabaseofhappiness.eur.nl