On the basis of cross-sectional data, O’Leary (1999) estimated that the prevalence of physical aggression by men would show a sharp rise from ages 15 - 25 years, a peak prevalence at around age 25 years, and a sharp decline to about age 35 years. Several studies on nationally representative and community samples have indicated that the prevalence rates of aggression toward a partner tend to be highest at young ages and to decrease with age (Archer Gelles, & Straus, 1988). Understanding intraindividual changes in partner aggression would be highly informative for prevention and treatment programs and thus is a key research priority. Aggression toward a partner in both physically and verbally or emotionally abusive forms has very negative outcomes for adults, including injury ( Archer, 2000) and relationship breakdown ( Lawrence & Bradbury, 2001).
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