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Clinical Trial Details — Status: Completed

Administrative data

NCT number NCT01127698
Other study ID # 1706/2010-631-1
Secondary ID
Status Completed
Phase N/A
First received May 20, 2010
Last updated February 27, 2014
Start date March 1987

Study information

Verified date February 2014
Source Karolinska Institutet
Contact n/a
Is FDA regulated No
Health authority Sweden: Ethical Rewiev BoardSweden: The Swedish Data Inspection Board
Study type Observational

Clinical Trial Summary

The Swedish Mammography Cohort began in 1987-1990, when 66,651 women living in two counties in central Sweden completed a mailed questionnaire that included items about their diet, parity, age at first child's birth, history of breast cancer in family, weight, height, and education. Follow-up questionnaires have been sent out in 1997 and in 2008-09.


Description:

From 1987 to 1990 a population-based mammography screening program was introduced in two counties in central Sweden. In Västmanland County all women born between 1917 and 1948 received a mailed invitation to be screened by mammography between March 1987 and March 1989 (n=41,786) together with a 6-page questionnaire; 31,735 women (76%) returned the completed questionnaires. In Uppsala County all women born between 1914 and 1948 were invited to the screening and received the same questionnaire between January 1988 and December 1990 (n=48517); 34916 women (72%) returned the completed questionnaires. Hence, questionnaires completed before undergoing mammography were obtained from 66,651 women (74%) in the source population. These questionnaires included items about diet, parity, age at first child's birth, history of breast cancer in family, weight, height, and education.

In 1997 a second questionnaire was sent to all cohort members who were still living in the study area. The questionnaire updated information about diet and was extended to include information on physical activity, medical history, age at menarche, history of oral contraceptive use, age at menopause, postmenopausal hormone use and lifestyle factors such as cigarette smoking history and use of dietary supplements. Majority of questions in the questionnaires have been validated.

During 2008-09, the exposure information was updated and extended by sending out two new questionnaires - one questionnaire on health including several signs of symptoms, sleeping, social relations etc (2008) and one on diet, dietary supplement use, and lifestyle factors (2009).

Incident cases of cancer are ascertained by record linkages of the study population with the National Swedish Cancer Register and the Regional Cancer Registers. Cardiovascular and other diseases as well as surgeries and causes of death are identified by linkage to the National Inpatient and other registries at the Swedish Board of Health and Welfare. Ascertainment of cancer cases and other diseases is almost 100% complete. Dates of deaths are ascertained through the Swedish Death Register (100% complete), and information on date of moving out of the study area is obtained by linkage with the Swedish Population Register.


Recruitment information / eligibility

Status Completed
Enrollment 61433
Est. completion date
Est. primary completion date December 1990
Accepts healthy volunteers No
Gender Female
Age group 40 Years to 74 Years
Eligibility Inclusion Criteria:

- All women born between 1914 and 1948, living in central Sweden

Exclusion Criteria:

Study Design

Observational Model: Cohort, Time Perspective: Prospective


Locations

Country Name City State
n/a

Sponsors (2)

Lead Sponsor Collaborator
Karolinska Institutet Harvard School of Public Health

Outcome

Type Measure Description Time frame Safety issue
Primary Breast cancer 1987-2010 No
Primary Colorectal cancer 1987-2010 No
Primary Endometrial Cancer 1987-2010 No
Primary Ovarian cancer 1987-2010 No
Primary Pancreatic cancer 1987-2010 No
Primary Stomach cancer 1987-2010 No
Primary Kidney cancer 1987-2010 No
Primary Bladder cancer 1987-2010 No
Primary Cardiovascular diseases 1987-2010 No
Primary Mortality 1987-2010 No
Primary Cataract 1987-2010 No
Primary Fractures, hip fractures 1987-2014 No
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