Study Bohn (1972): study ZZ Various nation sets 1960
- Public
 - 21+ aged, general public, Dominican Republic, Panama and Yugoslavia, ± 1960
 - Sample
 - Respondents
 - N = 5228
 - Non Response
 - Assessment
 - 
        Interview: face-to-face                    
Half-structured interview by native interviewers in each country. 
Correlate
- Authors's Label
 - Age
 - Our Classification
 - 
            
 - 
                        
 - Related specification variables
 - 
                
 - 
                            
 - Operationalization
 - 21-39 vs 40+
 
Observed Relation with Happiness
Stronger among those who have no children:
DM = + (01)