By Gena K. Dufour, Charlene Y. Senn, and Nicole K. Jeffrey

Accurate measurement of sexual violence (SV) victimization is important for informing research, policy, and service provision. Measures such as the Sexual Experiences Survey (SES) that use behaviorally specific language and a specified reference period (e.g., since age 14, over the past 12 months) are considered best practice and have substantially improved SV estimates given that so few incidents are reported to police. However, to date, we know little about whether estimates are affected by respondents’ reporting of incidents that occurred outside of the specified reference period (i.e., reference period errors). The current study explored the extent, nature, and impact on incidence estimates of reference period errors in two large, diverse samples of post-secondary students. Secondary analysis was conducted of data gathered using a follow-up date question after the Sexual Experiences Survey–Short Form Victimization. Between 8% and 68% of rape and attempted rape victims made reference period errors, with the highest proportion of errors occurring in the survey with the shortest reference period (1 month). These errors caused minor to moderate changes in time period-specific incidence estimates (i.e., excluding respondents with errors reduced estimates by up to 7%). Although including a date question does not guarantee that all time period-related errors will be identified, it can improve the accuracy of SV estimates, which is crucial for informing policy and prevention. Researchers measuring SV within specific reference periods should consider collecting dates of reported incidents as best practice.

Ontario, Canada: Journal of Interpersonal Violence, 2023. 26p.

By Jeff R. Temple, Elizabeth Baumler,and Christie Shumate; et al.

Decades of inquiry on intimate partner violence show consistent results: violence is woefully common and psychologically and economically costly. Policy to prevent and effectively intervene upon such violence hinges upon comprehensive understanding of this phenomenon at a population level. The current study prospectively estimates the cumulative incidence of sexual and physical dating violence (DV) victimization/perpetration over a 12-year timeframe (2010–2021) using diverse participants assessed annually from age 15 to 26. Data are from Waves 1–13 of an ongoing longitudinal study. Since 2010 (except for 2018 and 2019), participants were assessed on past-year physical and sexual DV victimization and perpetration. Participants (n= 1,042; 56% female; Mage baseline = 15) were originally recruited from seven public high schools in southeast Texas. The sample consisted of Black/African American (30%), White (31%), Hispanic (31%), and Mixed/Other (8%) participants. Across 12 years of data collection, 27.3% experienced sexual DV victimization and 46.1% had experienced physical DV victimization by age 26. Further, 14.8% had perpetrated at least one act of sexual DV and 39.0% had perpetrated at least one act of physical DV against a partner by this age. A 12-year cumulative assessment of physical and sexual DV rendered prevalence estimates of both victimization and perpetration that exceeded commonly and consistently reported rates in the field, especially on studies that relied on lifetime or one-time specified retrospective reporting periods. These data suggest community youth are at continued and sustained risk for DV onset across the transition into emerging adulthood, necessitating early adolescent prevention and intervention efforts that endure through late adolescence, emerging adulthood, and beyond. From a research perspective, our findings point to the need for assessing DV on a repeated basis over multiple timepoints to better gauge the full extent of this continued public health crisis.

Galveston, TX: Journal of Interpersonal Violence, 2024. 21p.

By Solveig K. B. Vatnar, Christine Friestad, and Stål Bjørkly

Intimate partner homicide (IPH) is an extreme outcome of intimate partner violence (IPV). It is a societal challenge that needs to be investigated over time to see whether changes occur concerning the incidence of IPH, IPH characteristics, socioeconomic factors, and contact with service providers. This study includes the total Norwegian cohort of IPHs between 1990 and 2019 with a final conviction (N = 224). Poisson regression was applied to model the incidence rate of homicide and IPH between 1990 and 2020 as well as the incidence rates of immigrant perpetrators and victims. Multivariate logistic regression analyses were used to test the association between characteristics and period 1990–2012 compared to after 2012 as dependent variable. The results show that though homicide incidence rates in Norway declined steadily and significantly after 1990, IPH rates did not begin to decline until 2015. The following IPH characteristics showed reduced incidence after 2012: IPH-suicide, perpetrators with a criminal record, and IPHs perpetrated subsequent to preventive interventions towards the perpetrator. Sentence length in IPH cases had increased. Changes were not observed for any of the other IPH characteristics investigated. IPH is often the culmination of long-term violence and can be prevented, even if risk assessment is challenging due to the low base rates.

Oslo, Norway: Journal of Interpersonal Violence, 2023. 27p