Study Heukamp & Arino (2011): study ZZ World samples 1981
- Public
 - 18+ aged general public, 64 countries, 1981-2004
 - Sample
 - Respondents
 - N = 114281
 - Non Response
 - Assessment
 - Interview: face-to-face
 
Correlate
- Authors's Label
 - Natality rate in the country where one lives
 - Our Classification
 - 
            
 - 
                        
 - Distribution
 - Range 10-45, M= 18.52, SD= 7.36
 - Operationalization
 - Number of life births per year per 1000 people
 
Observed Relation with Happiness
B controlled for:
- GDP growth
- inflation
- population of country
- infant mortality
- life expectation
- natality rate
- quality of government
- corruption
- suicide rate
- number of legal abortions
- share of GDP that a country spends on health
- dominant religious faiths in a given country