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To learn more about how the project began and how the experimental design was implemented, please select one of the options below:
 
 
 
Ø Origins
- a brief history of the study
Ø Participant Coding Key
- a description of the classification system used to categorize participants
Ø Study Design
- a table showing who was interviewed at each time
Ø Demographic Information
- tables showing race, gender, marital status for both mothers and children
Ø Participation Over Time
- a list showing the number of participants at each time

Comments or questions? Please send them to curransr@ssc.upenn.edu.
©1997 University of Pennsylvania; Last Updated on June 3, 2003