Table 2.
Relationship Between Systolic Blood Pressure and UV Light as Well as Temperature, Stratified by Skin Color and Wavelength Band
| Model | UV Spectrum | White | Black | ||
|---|---|---|---|---|---|
| SBP Change Per Unit | 95% CIs | SBP Change Per Unit | 95% CIs | ||
| 1 | UVA | −0.78 | (−0.81 to −0.76) | −0.64 | (−0.68 to −0.61) |
| UVB | −13.24 | (−13.69 to −12.79) | −10.77 | (−11.32 to −10.21) | |
| 2 | UVA | −0.75 | (−0.78 to −0.72) | −0.63 | (−0.66 to −0.59) |
| UVB | −12.73 | (−13.22 to −12.23) | −10.49 | (−11.07 to −9.91) | |
| 3 | UVA | −0.32 | (−0.37 to −0.27) | −0.23 | (−0.29 to −0.16) |
| Temperature | −8.13 | (−8.99 to −7.27) | −7.37 | (−8.47 to −6.26) | |
| UVB | −5.63 | (−6.48 to −4.78) | −4.17 | (−5.26 to −3.08) | |
| Temperature | −7.92 | (−8.78 to −7.07) | −7.04 | (−8.15 to −5.94) | |
Units for UV and temperature are 100×mm Hg/(W×m−2) and 100×mm Hg/°C, respectively, where a unit of 1.0 represents a change of population blood pressure of 1 mm Hg for a change of incident UV of 100 W/m2 or a change of temperature of 100°C. Model 1, no adjustment; Model 2, adjusted for clinical covariates and comorbidities; Model 3, model 2 with additional adjustment for ambient temperature; see Methods for details. Racial differences for the effects of UV radiation on blood pressure were significant in all models. SBP indicates systolic blood pressure.