Umishio W, Ikaga T, Kario K, et al. - Including 3,775 participants (2,095 households), researchers performed the first large nationwide survey investigating the link between home blood pressure and indoor temperature in winter, using a multilevel model. They performed cross-sectional analyses with approximately 2,900 participants (1,840 households) and found that significantly higher sensitivity to alterations in indoor temperature was displayed by systolic blood pressure in the morning vs that in the evening in individuals aged 57 years (mean age in this survey). A nonlinear link between morning systolic blood pressure and indoor temperature was identified, which was indicative of the variable influence of indoor temperature on blood pressure based on the room temperature range. The vulnerability of systolic blood pressure to indoor temperature change was suggested in older residents and women.