Most meta-analyses combine correlational estimates. Why? Well, outcome measures are often related but not identical. In the literature on happiness, for instance, a variety of scales are used that have strong correlations but different scaling factors. However, the use of correlations and the frequent use of unrepresentative populations means that range restriction can pose a serious problem.
The solution?
Take each study's slope, multiply by the population-wide standard deviation of the "x" variable and divide by the population-wide standard deviation of the "y" variable. This yields a correlation estimate adjusted for range restriction.
Spreads
BMI has a standard deviation (SD) of 5.4 kg/m^2 Block
The postive PANAS has a SD of 7.65. The negative one has a SD of 5.90 Crawford
For the Satisfaction with Life Scale, the weighted average of the samples SDs in Table 1 is 6.32. It is 6.06 in student samples and 6.74 in the adult samples Pavot.
The flourishing scale has a SD of 6.56 among college students New well-being measures: Short scales to assess flourishing and positive and negative feelings
Correlates
This study Robertson looks at weight buckets and the average wellbeing of each bucket. Let's assume the normal weight bucket has an average BMI of 23 and the Class 3 Obesity bucket has an average BMI of 45. Then, positive PANAS and obesity have r~0.22, and the flourishing scale has r~0.37.
A doubling in income is associated with a 0.14 SD increase in life satisfaction Killingsworth for a r~0.14. However, a meta-analysis suggests r~0.22 Tan.
Neuroticism, conscientiousness, and (especially) extraversion are important personality factors Anglim. The downside is I can't find a copy. The good news is that I did find the end results:
See also Steel
Attachment style is correlated with happiness - either r~0.28 or r~0.37 depending on your assumptions.
IQ does not correlate with happiness Veenhoven
Height very weakly (r~0.03) with happiness Carrieri
Narcissism (r~0.26) Zajenkowski
Educational attainment correlates decently (r~0.3), but this largely disappears after controlling for income Cuñado. Another study found a correlation of 0.02 Kroll.
Self control (r~0.50) Cheung
Gratitude (r~0.45) McCullough Portocarrero
So, to sum up:
Factor
Correlation
Self Control
0.50
Neuroticism
-0.46
Gratitude
0.45
Extraversion
0.37
Conscientiousness
0.36
Secure Attachment
0.33
BMI
0.30
Narcissism
0.26
Agreeableness
0.25
Income
0.22
Openness
0.19
Educational attainment
~0.16
Height
0.03
Intelligence
0
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Moghadam, M., Rezaei, F., Ghaderi, E., & Rostamian, N. (2016). Relationship between attachment styles and happiness in medical students. Journal of family medicine and primary care, 5(3), 593. https://doi.org/10.4103%2F2249-4863.197314
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