Study Ventegodt (1997): study DK 1993
- Public
 - 31-33 aged, born at the university hospital, Denmark, 1993
 - Sample
 - Respondents
 - N = 4626
 - Non Response
 - 36%
 - Assessment
 - 
        Questionnaire: Paper & Pencil Interview (PAPI)                    
Data were taken from the medical files of mothers and their babies 
Correlate
- Authors's Label
 - Parents' sexual intercourse during pregnancy
 - Our Classification
 - 
            
 - 
                        
 - Distribution
 - N: all:4252, 1:6%, 2:7%, 3:16%, 4:57%, 5:12%, 6:2%
 - Operationalization
 - Parents sexual intercourse during pregnancy as reported in medical file
1: none
2: in the first trimester
3: in the second trimester
4: in the third trimester
5: last month before birth
6: last three days before birth 
Observed Relation with Happiness
2: Mt=7.90
3: Mt=7.65
4: Mt=7.71
5: Mt=7.76
6: Mt=7.73
All Mt=7.73
2: Mt=7.61
3: Mt=7.33
4: Mt=7.38
5: Mt=7.50
6: Mt=7.63
All Mt=7.40
2: Mt=7.10
3: Mt=6.95
4: Mt=7.01
5: Mt=6.99
6: Mt=7.50
All Mt=7.01