Nurses' Health Study (Original cohort) [NHS]
GENERAL INFORMATION
| Name | Nurses' Health Study (Original cohort) |
|---|---|
| Acronym | NHS |
| Last update | 05/08/2008 |
Principal investigator
No information available
Contact
|
Frank Speizer (Dr.)
|
Harvard University, Boston
Boston Email: frank.speizer@channing.harvard.edu 
|
Website
OBJECTIVES
The initial focus of the study was to investigate the potential long term consequences of the use of oral contraceptives. However, the focus have been enlarge and the study currently investigate potential biomarkers, such as hormone levels and genetic markers.
METHODS
Legend
Yes
No
Unknown
|
General design
| Study design | Cohort |
|---|---|
| Type of participants | Individuals |
| Target or final number of participants | 170000 |
| Target or final number of DNA | No information available |
Participant selection / Characteristics of the population
Selection criteria
 Gender
|
Women |
|
Age
|
Minimun: 30 years Maximun: 55 years |
|
Country of residence
|
United States |
|
Other criteria
|
Married nurses who lived in 11 states. |
STATUS
Current status
| Phase | Start | End |
|---|---|---|
| Preparation phase/Pilot | -- | -- |
| Baseline recruitment / initial data collection | 1976 | 1976 |
| Follow-up of participants | 1976 | -- |
Supplementary informations
Diet questionnaires collected in 1980, 1984, 1986 and every four years since. Blood samples collected in 1989-1990 and 2000-2001.
| Current number of participants recruited | 122000 |
|---|
| Current number of collected DNA samples | 33000 |
|---|
