The researchers explain that common stressors, such as arguing with family or friends, are among the most powerful predictors of psychological distress. The current study investigated the potential physiological impact in 69 individuals with an average age of 17 years from Latin American and European backgrounds. Participants completed a check-list on 14 consecutive nights, reporting any negative interpersonal interactions with family, peers or school personnel (including disagreements, harassment or punishments). The study allowed for variables as socioeconomic status, major stressful life events and over-sensitivity to rejection. Researchers found that daily interpersonal stress was associated with elevated levels of inflammation, as measured by higher levels of CRP in blood samples assayed an average of eight months later.