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Mean blood pressure and the prevalence of hypertensionvary widely throughout the world (1). Geographical latitudehas been cited as a possible explanation for this variance (2–5), with increasing distance from the equator being associatedwith higher blood pressures. However, these statements areoften not referenced (3) or refer to data from a post-hoc analysisof the International Study of Sodium, Potassium, andBlood Pressure (INTERSALT) (2, 4), which was publishedas a hypothesis paper in which the authors did not adequatelyreport the methodology so as to allow others to assess thevalidity of the results (6). In other studies in which similar findingswere reported, the differences observed were either explainedby factors such as salt intake (7) or were confoundedby other significant differences in characteristics such as renalfunction, diabetes prevalence, lifestyle, and diet (8–12). Ambienttemperature and number of daylight hours have also beenreported to affect blood pressure and the prevalence of hypertension(13–15)

american journal of epidemiology

Associations of Blood Pressure With Geographical Latitude, Solar Radiation, and Ambient Temperature: Results From the Chilean Health Survey, 2009–2010: Table 1.