MBP and Hypertension: Hourly averaged temperature (°C) within the hour of blood pressure measurement had a negative relationship with the mean value of MBP with a slope of −0.55 mm Hg/°C (Multimedia Appendix 3), but this negative slope was modified to some extent by the covariates hypertension, diabetes, ACEIs, ARBs, CCBs, and diuretics, which are the so-called effect modifiers in the epidemiological and statistical literature.