Variables related to Sun exposure
id | Variable | Description | Collected | File |
|---|---|---|---|---|
| idLATREGION | VariableLatitude (degrees N) of CC at CT randomization/OS enrollment | Description *Region of residence at the time of randomization or enrollment, based on the latitude of the responsible clinical center. | CollectedBaseline, Main | FileDemographics and Study Membership |
| idWATTSCAT | VariableWatts ((J/s) per m2) of CC at CT randomization/OS enrollment | Description *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. | CollectedBaseline, Main | FileDemographics and Study Membership |
| idLANGLEYSCAT | VariableLangleys (g-cal per cm2) of CC at CT randomization/OS enrollment | Description *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. | CollectedBaseline, Main | FileDemographics and Study Membership |
| idLATREGIONCAD | VariableLatitude (degrees N) of CC at CaD randomization | Description *Region of residence at the time of CaD trial randomization, based on the latitude of the responsible clinical center. | CollectedBaseline, Main | FileDemographics and Study Membership |
| idWATTSCATCAD | VariableWatts ((J/s) per m2) of CC at CaD randomization | Description *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. | CollectedBaseline, Main | FileDemographics and Study Membership |
| idLANGLEYSCATCAD | VariableLangleys (g-cal per cm2) of CC at CaD randomization | Description *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. | CollectedBaseline, Main | FileDemographics and Study Membership |
| idEXPOSURE_4 | VariableSkin reaction to sun | DescriptionAfter you have been out in the sun for 45-60 minutes for the first time during summer, which describes the reaction of your unprotected skin in exposed areas? | CollectedMain | FileForm 144 - OS Follow-Up Year 4 |
| idSMSNCHLD_4 | VariableTime outdoors/summer/childhood | DescriptionTime outdoors/summer/During childhood (5-12 years old) | CollectedMain | FileForm 144 - OS Follow-Up Year 4 |
| idSMSNTEEN_4 | VariableTime outdoors/summer/teens | DescriptionTime outdoors/summer/During your teens | CollectedMain | FileForm 144 - OS Follow-Up Year 4 |
| idSMSNTHRT_4 | VariableTime outdoors/summer/thirties | DescriptionTime outdoors/summer/During your thirties | CollectedMain | FileForm 144 - OS Follow-Up Year 4 |
