Knowing your partner is not enough: spousal importance moderates the link between attitude familiarity and ambulatory blood pressure

Close relationships have been linked to cardiovascular morbidity and mortality. More research is needed, however, on the social
and biological processes responsible for such links. In this study, we examined the role of relationship-based attitudinal
processes (i.e., attitude familiarity and partner importance) on ambulatory blood pressure during daily life. Forty-seven
married couples completed a questionnaire regarding their own attitudes, perceptions of their partner’s attitudes, and perceptions
of partner importance. They also underwent a 1-day ambulatory assessments of daily spousal interactions and blood pressure.
Partner importance was related to better interpersonal functioning (e.g., partner responsiveness) and lower ambulatory systolic
blood pressure. More interestingly, partner importance moderated the links between attitude familiarity and both ambulatory
systolic and diastolic blood pressure. This statistical interaction revealed that simply knowing a partner’s attitudes was
not enough as partner knowledge was primarily related to lower ambulatory blood pressure when they were also viewed as more
important. These data are discussed in light of how attitude familiarity and spousal importance may jointly influence health
outcomes and the social-cognitive mechanisms potentially responsible for such links.