This document can be used to prepare or evaluate feasibility of ancillary study proposals and paper proposals, but is NOT intended for publication.

Demographics and Study Membership (CT+OS)

File NameData as ofPopulationData collectedOne row perRows
dem_ctos_inv.dat9/12/2005CT+OSBaseline, MainParticipant161,808
ID - WHI Participant Common ID
Col 2
NMissing
161,8080
CTFLAG - CT Participant
Col 3
Indicates if a participant has been randomized to one or more of the Clinical Trial components (HRT, CAD, DM).
ValueDescriptionN%
0No93,67657.9
1Yes68,13242.1
HRTFLAG - HRT Participant
Col 4
Indicates if a participant has been randomized to the Hormone Replacement Therapy Trial.
ValueDescriptionN%
0No134,46183.1
1Yes27,34716.9
DMFLAG - DM Participant
Col 5
Indicates if a participant has been randomized to the Dietary Modification Trial.
ValueDescriptionN%
0No112,97369.8
1Yes48,83530.2
CADFLAG - CAD Participant
Col 6
Indicates if a participant has been randomized to the Calcium and Vitamin D Trial.
ValueDescriptionN%
0No125,52677.6
1Yes36,28222.4
OSFLAG - OS Participant
Col 7
Indicates if a participant has been enrolled into the Observational Study.
ValueDescriptionN%
0No68,13242.1
1Yes93,67657.9
AGE - Age at screening
Col 8
Age at screening. Computed from Form 2 birth date.
Usage Notes: Age at screening may differ from the age stratum to which a participant was randomized, due to participants requesting a correction to their Form 2 birth date after randomization. Once a participant was randomized to a specific age stratum, they remained in that stratum despite corrections to their birth date. Therefore, the "Age stratum at randomization or enrollment" variable may differ from the age reflected in this variable.
NMissingMinMaxMeanStdDev
161,8080498163.2387.236
AGER - Age group at screening
Col 9
Computed from Form 2 birth date. Age categorized into three 10-year intervals (<50-59, 60-69 and 70-79+).
Usage Notes: Categorization of this variable may differ from the "Age stratum at randomization or enrollment" variable due to participants requesting a correction to their Form 2 birth date after randomization/enrollment.
ValueDescriptionN%
1<50-5953,55933.1
260-6972,58944.9
370-79+35,66022
AGESTRAT - Age stratum at randomization or enrollment
Col 10
Usage Notes: Based on the birth date reported by the participant at the time of randomization or enrollment. Categorization of the Age at Screening variable may differ due to participants requesting a correction to their Form 2 birth date after randomization.
ValueDescriptionN%
150 to 5421,57013.3
255 to 5931,98319.8
360 to 6972,58844.9
470 to 7935,66722
REGION - U. S. Region
Col 11
Residence at the time of randomization or enrollment. Four categories based on US Census definition.
ValueDescriptionN%
1Northeast36,91322.8
2South41,91925.9
3Midwest35,56322
4West47,41329.3
LANG - Preferred Language
Col 12
ValueDescriptionN%
1English160,16599
2Spanish1,6431
EDUC - Education
Col 13
ValueDescriptionN%
1Didn't go to school1310.1
10Master's Degree23,66714.6
11Doctoral Degree (Ph.D,M.D.,J.D.,etc.)3,9602.4
2Grade school (1-4 years)5990.4
3Grade school (5-8 years)1,9351.2
4Some high school (9-11 years)5,9793.7
5High school diploma or GED27,62417.1
6Vocational or training school16,42910.2
7Some college or Associate Degree44,48027.5
8College graduate or Baccalaureate Degree17,56610.9
9Some post-graduate or professional18,22211.3
Missing1,2160.8%
INCOME - Family Income
Col 14
ValueDescriptionN%
1Less than $10,0006,9374.3
2$10,000 to $19,99918,49911.4
3$20,000 to $34,99936,66522.7
4$35,000 to $49,99930,91219.1
5$50,000 to $74,99929,94818.5
6$75,000 to $99,99913,6138.4
7$100,000 to $149,9999,4375.8
8$150,000 or more4,9233
9Don't know4,3842.7
Missing6,4904%
HRTARM - HRT Arm
Col 15
Hormone Replacement Therapy study arm to which the participant was randomized
ValueDescriptionN%
0Not randomized to HRT134,46183.1
1E-alone intervention5,3103.3
2E-alone control5,4293.4
3E+P intervention8,5065.3
4E+P control8,1025
DMARM - DM Arm
Col 16
Dietary Modification study arm to which the participant was randomized
ValueDescriptionN%
0Not randomized to DM112,97369.8
1Intervention19,54112.1
2Control29,29418.1
CADARM - CaD Arm
Col 17
Calcium and vitamin D study arm to which the participant was randomized
ValueDescriptionN%
0Not randomized to CaD125,52677.6
1Intervention18,17611.2
2Control18,10611.2
CADDAYS - Days since CT randomization to CaD randomization
Col 18
NMissingMinMaxMeanStdDev
161,8080083390.263174.949
BMDFLAG - Rand to BMD
Col 19
Indicates if the participant was randomized or enrolled at a bone density clinic and was not randomized or enrolled as a part of enhanced recruitment for that clinic.
ValueDescriptionN%
0No150,78893.2
1Yes11,0206.8
SHAREPPT - SHARe Analytic Sample Flag
Col 20
Indicates if a participant is part of the WHI SHARe (SNP Health Association Resource)
ValueDescriptionN%
0No149,80092.6
1Yes12,0087.4
LATREGION - Latitude (degrees N) of CC at CT randomization/OS enrollment
Col 21
Usage Notes: Region of residence at the time of randomization or enrollment, based on the latitude of the responsible clinical center.
ValueDescriptionN%
1Southern: < 35 degrees N51,26531.7
2Middle: 35-40 degrees N44,15027.3
3Northern: > 40 degrees N66,39341
WATTSCAT - Watts ((J/s) per m2) of CC at CT randomization/OS enrollment
Col 22
Usage Notes: The WATT is a unit of solar irradiance and measures the daily UVB flux reaching the earth, within the wavelength range necessary for vitamin D synthesis. The information is in: Lubin D, Jensen EH, Gies HP. Global surface ultraviolet radiation climatology from TOMS and ERBE data. Journal of Geophysical Research 1998;103 (D20):26061-26091. Categories are based on the WATTs of the clinical center at the time of randomization or enrollment.
ValueDescriptionN%
10.4 - 0.537,47723.2
20.735,01921.6
31.029,93218.5
41.436,46722.5
51.5-1.922,91314.2
LANGLEYSCAT - Langleys (g-cal per cm2) of CC at CT randomization/OS enrollment
Col 23
Usage Notes: The Langley is a unit of solar irradiance and relates to the amount that reaches a given area of the earth’s surface. The information is from national weather data on total solar irradiance in the United States and is adapted from Garland and Garland (Do sunlight and vitamin D reduce the likelihood of colon cancer? Int J Epidemiol 1980;9:227-31.) Categories are based on the Langleys of the clinical center at the time of randomization or enrollment.
ValueDescriptionN%
1300-32545,68028.2
235034,04321
3375-38019,06511.8
4400-43027,55117
5475-50035,46921.9
LATREGIONCAD - Latitude (degrees N) of CC at CaD randomization
Col 24
Usage Notes: Region of residence at the time of CaD trial randomization, based on the latitude of the responsible clinical center.
ValueDescriptionN%
1Southern: < 35 degrees N10,8786.7
2Middle: 35-40 degrees N10,0436.2
3Northern: > 40 degrees N15,3619.5
Missing125,52677.6%
WATTSCATCAD - Watts ((J/s) per m2) of CC at CaD randomization
Col 25
Usage Notes: The WATT is a unit of solar irradiance and measures the daily UVB flux reaching the earth, within the wavelength range necessary for vitamin D synthesis. The information is in: Lubin D, Jensen EH, Gies HP. Global surface ultraviolet radiation climatology from TOMS and ERBE data. Journal of Geophysical Research 1998;103 (D20):26061-26091. Categories are based on the WATTs of the clinical center at the time of CaD trial randomization.
ValueDescriptionN%
10.4 - 0.58,2575.1
20.78,4665.2
31.06,4744
41.48,2035.1
51.5-1.94,8823
Missing125,52677.6%
LANGLEYSCATCAD - Langleys (g-cal per cm2) of CC at CaD randomization
Col 26
Usage Notes: The Langley is a unit of solar irradiance and relates to the amount that reaches a given area of the earth’s surface. The information is from national weather data on total solar irradiance in the United States and is adapted from Garland and Garland (Do sunlight and vitamin D reduce the likelihood of colon cancer? Int J Epidemiol 1980;9:227-31.) Categories are based on the Langleys of the clinical center at the time of CaD trial randomization.
ValueDescriptionN%
1300-32510,7176.6
23507,8004.8
3375-3804,0212.5
4400-4306,0333.7
5475-5007,7114.8
Missing125,52677.6%