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Air conditioning has not totally canceled the latitude effective in the US yet – July 2013

Prospective Study of Ultraviolet Radiation Exposure and Mortality Risk in the United States

Am. J. Epidemiol. (2013) 178 (4): 521-533. doi: 10.1093/aje/kws589
Shih-Wen Lin*, David C. Wheeler, Yikyung Park, Michael Spriggs, Albert R. Hollenbeck, D. Michal Freedman and Christian C. Abnet
↵*Correspondence to Dr. Shih-Wen Lin, Nutritional Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, 9609 Medical Center Drive, 6E404, MSC9768, Bethesda, MD 20892 (e-mail: lins4 at mail.nih.gov).

Geographic variations in mortality rate in the United States could be due to several hypothesized factors, one of which is exposure to solar ultraviolet radiation (UVR). Limited evidence from previous prospective studies has been inconclusive. The association between ambient residential UVR exposure and total and cause-specific mortality risks in a regionally diverse cohort (346,615 white, non-Hispanic subjects, 50–71 years of age, in the National Institutes of Health (NIH)–AARP Diet and Health Study) was assessed, with accounting for individual-level confounders. UVR exposure (averaged for 1978–1993 and 1996–2005) from NASA's Total Ozone Mapping Spectrometer was linked to the US Census Bureau 2000 census tract of participants' baseline residence. Multivariate-adjusted Cox proportional-hazards models were used to estimate hazard ratios and 95% confidence intervals. Over 12 years, UVR exposure was associated with total deaths (n = 41,425; hazard ratio for highest vs. lowest quartiles (HRQ4 vs. Q1) =

  • 1.06, 95% confidence interval (CI): 1.03, 1.09; Ptrend < 0.001) and with deaths (all Ptrend < 0.05)
  • due to cancer (HRQ4 vs. Q1 = 1.06, 95% CI: 1.02, 1.11),
  • cardiovascular disease (HRQ4 vs. Q1 = 1.06, 95% CI: 1.00, 1.12),
  • respiratory disease (HRQ4 vs. Q1 = 1.37, 95% CI: 1.21, 1.55), and
  • stroke (HRQ4 vs. Q1 = 1.16, 95% CI: 1.01, 1.33)
  • but not with deaths due to injury, diabetes, or infectious disease.

These results suggest that UVR exposure might not be beneficial for longevity.

Difference in death rate highest to lowest UV:
Summary by VitaminDWiki

Total 6 %
Cancer 6%
Cardiovacsular 6%
Respiratory 37%
Stroke 16%

PDF is attached at the bottom of this page

See also VitaminDWiki

Shows decrease of association of MS with latitude during 2oth century wars - probably due to people in the South being able to be indoors due to air conditioning

Attached files

ID Name Comment Uploaded Size Downloads
2887 UVR lifespan.jpg admin 08 Aug, 2013 66.61 Kb 1115
2886 UV extends lifespan.pdf admin 08 Aug, 2013 231.83 Kb 829