BACKGROUND AND AIMS: Restrictive late-night alcohol policies are aimed at reducing alcohol-related violence. Yet to date, no evaluations of their impact on family and domestic violence have been conducted. This study aimed to measure whether modifying the drinking environment and restricting on-site trading hours affected reported rates of family and domestic violence.

DESIGN: Non-equivalent control group design with two treatment sites and two matched control sites with pre and post intervention data on rates of family and domestic violence assaults. Local catchment areas of four late-night entertainment precincts in New South Wales, Australia, covering a population of 27,309 people.

PARTICIPANTS/CASES: Monthly counts of police-recorded incidents of domestic violence assaults, from January 2001 to December 2019. Interventions and comparators Two variations of restrictive late-night interventions: restricted entry to late-night venues after 1:30am, trading ceasing at 3:30am, and other restrictions on alcohol service (Newcastle); restricted entry to late-night venues after 1am and a range of restrictions on alcohol service (Hamilton).

COMPARATORS were no restrictions on late-night trading or modifications of the drinking environment (Wollongong and Maitland). Measurements were the rate, type and timing of reported family and domestic violence assaults.

FINDINGS: Reported rates of domestic violence assaults fell at both intervention sites, while reported domestic violence assaults increased over time in the control sites. The protective effects in Newcastle were robust and statistically significant across three main models. The relative reduction associated with the intervention in Newcastle was 29% (incidence rate ratio = 0.71, 95% confidence interval: 0.60 - 0.83) and an estimated 204 assaults were prevented across the duration of the study. The protective effects found in Hamilton were not consistently supported across the three main models.

CONCLUSIONS: Increases to late-night alcohol restrictions may reduce rates of domestic violence.