Low human papillomavirus vaccine uptake among women engaged in HIV care in Ontario, Canada.

Women living with HIV are at higher risk for human papillomavirus (HPV)-related dysplasia and cancers and thus are prioritized for HPV vaccination. We measured HPV vaccine uptake among women engaged in HIV care in Ontario, Canada, and identified socio-demographic, behavioural, and clinical characteristics associated with HPV vaccination. During annual interviews from 2017 to 2020, women participating in a multi-site, clinical HIV cohort responded to a cross-sectional survey on HPV vaccine knowledge and receipt. We used logistic regression to derive age-adjusted odds ratios and 95% confidence intervals (CI) for factors associated with self-reported vaccine initiation (≥1 dose) or series completion (3 doses). Among 591 women (median age = 48 years; interquartile range = 40-56 years), 13.2% (95%CI = 10.5-15.9%) had received ≥1 dose. Of those vaccinated, 64.6% had received 3 doses. Vaccine initiation (≥1 dose) was significantly higher among women aged 20-29 years at 31.0% but fell to 13.9% in those aged 30-49 years and < 10% in those aged ≥50 years. After age adjustment, vaccine initiation was significantly associated with being employed (vs. unemployed but seeking work), income $40,000-$59,999 (vs. <$20,000), being married/common-law (vs. single), living with children, immigrating to Canada >5 years ago (vs. immigrating ≤5 years ago), never smoking (vs. currently smoking), and being in HIV care longer (per 10 years). Similar factors were identified for series completion (3 doses). HPV vaccine uptake remains low among women living with HIV in our cohort despite regular engagement in care. Recommendations for improving uptake include education of healthcare providers, targeted community outreach, and public funding of HPV vaccination.

Long-distance travel for birthing among Indigenous and non-Indigenous pregnant people in Canada.

BACKGROUND: For Indigenous Peoples in Canada, birthing on or near traditional territories in the presence of family and community is of foundational cultural and social importance. We aimed to evaluate the association between Indigenous identity and distance travelled for birth in Canada. METHODS: We obtained data from the Maternity Experiences Survey, a national population-based sample of new Canadian people aged 15 years or older who gave birth (defined as mothers) and were interviewed in 2006-2007. We compared Indigenous with non-Indigenous Canadian-born mothers and adjusted for geographic and sociodemographic factors and medical complications of pregnancy using multivariable logistic regression. We categorized the primary outcome, distance travelled for birth, as 0 to 49, 50 to 199 or 200 km or more. RESULTS: We included 3100 mothers living in rural or small urban areas, weighted to represent 31 100 (1800 Indigenous and 29 300 non-Indigenous Canadian-born mothers). We found that travelling 200 km or more for birth was more common among Indigenous compared with non-Indigenous mothers (9.8% v. 2.0%, odds ratio [OR] 5.45, 95% confidence interval [CI] 3.52-8.48). In adjusted analyses, the association between Indigenous identity and travelling more than 200 km for birth was even stronger (adjusted OR 16.44, 95% CI 8.07-33.50) in rural regions; however, this was not observed in small urban regions (adjusted OR 1.04, 95% CI 0.37-2.91). INTERPRETATION: Indigenous people in Canada experience striking inequities in access to birth close to home compared with non-Indigenous people, primarily in rural areas and independently of medical complications of pregnancy. This suggests inequities are rooted in the geographic distribution of and proximal access to birthing facilities and providers for Indigenous people.

Effect of scattered-site housing using rent supplements and intensive case management on housing stability among homeless adults with mental illness: a randomized trial.

IMPORTANCE: Scattered-site housing with Intensive Case Management (ICM) may be an appropriate and less-costly option for homeless adults with mental illness who do not require the treatment intensity of Assertive Community Treatment. OBJECTIVE: To examine the effect of scattered-site housing with ICM services on housing stability and generic quality of life among homeless adults with mental illness and moderate support needs for mental health services. DESIGN, SETTING, AND PARTICIPANTS: The At Home/Chez Soi project was an unblinded, randomized trial. From October 2009 to July 2011, participants (N = 1198) were recruited in 4 Canadian cities (Vancouver, Winnipeg, Toronto, and Montreal), randomized to the intervention group (n = 689) or usual care group (n = 509), and followed up for 24 months. INTERVENTIONS: The intervention consisted of scattered-site housing (using rent supplements) and off-site ICM services. The usual care group had access to existing housing and support services in their communities. MAIN OUTCOMES AND MEASURES: The primary outcome was the percentage of days stably housed during the 24-month period following randomization. The secondary outcome was generic quality of life, assessed by a EuroQoL 5 Dimensions (EQ-5D) health questionnaire. RESULTS: During the 24 months after randomization, the adjusted percentage of days stably housed was higher among the intervention group than the usual care group, although adjusted mean differences varied across sites. [table: see text] The mean change in EQ-5D score from baseline to 24 months among the intervention group was not statistically different from the usual care group (60.5 [95%CI, 58.6 to 62.5] at baseline and 67.2 [95%CI, 65.2 to 69.1] at 24 months for the intervention group vs 62.1 [95% CI, 59.9 to 64.4] at baseline and 68.6 [95%CI, 66.3 to 71.0] at 24 months for the usual care group, difference in mean changes, 0.10 [95%CI, −2.92 to 3.13], P=.95). CONCLUSIONS AND RELEVANCE: Among homeless adults with mental illness in 4 Canadian cities, scattered site housing with ICM services compared with usual access to existing housing and community services resulted in increased housing stability over 24 months, but did not improve generic quality of life. TRIAL REGISTRATION: isrctn.org Identifier: ISRCTN42520374.

Evaluation of the Safety of a Vancomycin Nomogram Used to Achieve Target Trough Concentrations.

BACKGROUND: Dosing vancomycin to achieve target concentrations of 15 to 20 mg/L has been recommended for select infections. To date, few vancomycin nomograms designed to target these higher concentrations have been published, and only one has been published in North America. Based on the success of this nomogram in developing empiric vancomycin regimens that achieve higher target trough concentrations with low rates of nephrotoxicity, a vancomycin nomogram targeting concentrations of 15 to 20 mg/L was developed and implemented at Emory University Hospital and Emory University Hospital Midtown. OBJECTIVE: To evaluate the impact of a vancomycin-dosing nomogram on the incidence of vancomycin- associated nephrotoxicity and the time to achieve targeted trough concentrations. METHODS: A retrospective chart review of 200 patients who received vancomycin dosed to achieve target trough serum concentrations of 15 to 20 mg/L was performed. RESULTS: After implementation of the vancomycin nomogram, no statistically significant difference in incidence of vancomycin-associated nephrotoxicity was found (14% vs 16%; P = .197). Fewer patients had an initial vancomycin trough concentration within target range (29.1% vs 21.7%; P < .001). Adherence to the nomogram was poor, with only 41% of patients being dosed per the nomogram's recommendations. CONCLUSION: Based on our results, implementation of a vancomycin dosing nomogram had no impact on the incidence of nephrotoxicity, and significantly fewer patients had an initial vancomycin trough within the target range of 15 to 20 mg/L. The clinical utility of a vancomycin dosing nomogram is still to be determined.

Increased PrEP uptake and PrEP-RN coincide with decreased HIV diagnoses in men who have sex with men in Ottawa, Canada.

Background: We sought to evaluate if increased uptake of HIV pre-exposure prophylaxis (PrEP) correlated to population-level changes in human immunodeficiency virus (HIV) epidemiology, in a setting with an integrated PrEP delivery system centred on a public health nurse-led PrEP clinic and referral process. Methods: This study was conducted in Ottawa, Canada, where all positive HIV test results are reported to the public health units. Risk factor information is also collected by nurses and subsequently entered into a provincial database. We extracted these data for Ottawa from 2017 to 2021 and restricted our analyses to first-time diagnoses. Results: We identified 154 persons with a new HIV diagnosis. Over this period, the number of new diagnoses among men who have sex with men, the group most targeted for PrEP, decreased by 50%-60%. We did not identify changes in the number of new diagnoses based on race, intravenous drug use or among women. Conclusion: Increasing PrEP uptake in Ottawa in 2017 to 2021 coincided with a significant decrease in new HIV diagnoses among men who have sex with men. PrEP uptake in Ottawa, particularly by those most at risk, is likely supported by an integrated approach via PrEP-RN, a nurse-led public health program where individuals diagnosed with syphilis or rectal gonorrhea or chlamydia receive an automatic offer of PrEP. While these findings cannot causally link PrEP-RN or PrEP with this reduction in new HIV diagnoses, these changes in HIV epidemiology in Ottawa occurred exclusively among the group targeted for PrEP. These data highlight the efficacy and importance of PrEP.

Relationships to land as a determinant of wellness for Indigenous women, two-spirit, trans, and gender diverse people of reproductive age in Toronto, Canada.

OBJECTIVE: Disparities in Indigenous reproductive health reflect Canada's historic and ongoing colonial relationship with Indigenous peoples, which includes persistent inequities in health and social services. Reproductive justice scholars and activists advocate for intersectional approaches to enhancing Indigenous health equity that recognize land as a central determinant of wellness. The purpose of this study is to examine the association between relationships to land and wellness in a study of urban Indigenous women, two-spirit, trans, and gender diverse people of reproductive age in Canada's largest city, Toronto. METHODS: Data were obtained from the cross-sectional Our Health Counts (OHC) Toronto study, which employed respondent-driven sampling methods (n = 323) and a community-directed comprehensive health assessment survey. In an exploratory analysis, we took an Indigenous reproductive justice theoretical approach to multivariable logistic regression. RESULTS: After adjusting for covariates, there was a statistically significant positive association between relationships to the land and wellness that was estimated with good precision (OR 3.7, 95% CI 2.5-5.3). CONCLUSION: Our findings indicate that among urban Indigenous women, two-spirit, trans, and gender diverse people of reproductive age there is a positive association between feeling strong in their relationships to land and feeling balanced in the four domains of health (physical, spiritual, mental, and emotional). The community-based, community-directed design of OHC Toronto was congruent with a reproductive justice approach to research. Reproductive justice theories are adaptable to quantitative research on Indigenous reproductive health and can yield novel insights for supporting Indigenous wellness.

RéSUMé: OBJECTIF: Les disparités que connaissent les peuples autochtones sur le plan de la santé reproductive sont le reflet des relations coloniales historiques et continues du Canada avec ces peuples, encore entachées d'iniquités dans les domaines de la santé et des services sociaux. Théoricien·nes et militant·es de la justice reproductive préconisent des approches intersectionnelles pour améliorer l'équité en santé chez les peuples autochtones, approches qui reconnaissent le territoire comme un déterminant central du bien-être. Nous avons voulu examiner l'association entre les relations avec le territoire et le bien-être dans une étude menée auprès de femmes et de personnes autochtones bispirituelles, trans et de diverses identités de genre en âge de procréer vivant à Toronto, la plus grande ville du Canada. MéTHODE: Nos données proviennent de l'étude transversale Our Health Counts (OHC) Toronto, qui a employé des méthodes d'échantillonnage en fonction des répondant·es (n = 323) et une enquête d'évaluation globale de la santé dirigée par la communauté. Dans une analyse exploratoire, nous avons employé la régression logistique multivariée selon une approche théorique de justice reproductive autochtone. RéSULTATS: Après l'apport d'ajustements pour tenir compte des covariables, nous avons observé une association positive significative entre les relations avec le territoire et le bien-être, que nous avons estimée avec une bonne précision (RC 3,7, IC de 95 % 2,5­5,3). CONCLUSION: D'après nos constatations, il y a chez les femmes et les personnes autochtones bispirituelles, trans et de diverses identités de genre en âge de procréer vivant en milieu urbain une association positive entre un fort sentiment d'appartenance au territoire et un sentiment d'équilibre entre les quatre domaines de la santé (physique, spirituel, mental et émotionnel). L'étude OHC Toronto ayant été conçue par et pour la communauté, elle est conforme à une approche de recherche axée sur la justice reproductive. Les théories de la justice reproductive peuvent être adaptées à la recherche quantitative sur la santé reproductive autochtone, et elles peuvent jeter un nouvel éclairage sur les moyens d'appuyer le bien-être des personnes autochtones.

Alexithymia in People With Recurrent Suicide Attempts.

Background: Alexithymia, an inability to identify or describe emotions, is associated with suicidality yet the correlation with single or repeated suicide attempts is less clear. Aims: We aimed to assess the modifiability of alexithymia following a group psychosocial intervention focused on improving emotional literacy in those with a history of recurrent suicide attempts (RSA). Method: A total of 169 participants with self-reported RSA completed pre- and postgroup assessments of a 20-week group therapy intervention. Questionnaires assessed alexithymia, depression, impulsivity, and hopelessness; the Toronto Alexithymia Scale (TAS-20) was the primary outcome. Data were analyzed using multiple imputation. Results: Participants had on average 7.8 lifetime suicide attempts, 73% were female, and 16.6% had a >13-point reduction in TAS-20 scores after 20 weeks. Directed acyclic graph (DAG) analysis demonstrated significant relationships between alexithymia, depression, hopelessness, problem-solving, and satisfaction with life. Age of onset of suicidality was the only factor predictive of postintervention TAS-20 score in univariate linear regression. Limitations: The study limitations were its sample size, insufficient resources, and missing data. Conclusion: A change in TAS scores indicated that alexithymia can be a modifiable treatment target. Being able to identify and describe feelings may lead to improvement in depression, hopelessness, problem-solving, and satisfaction with life in this population.

The effect of a Housing First intervention on primary care retention among homeless individuals with mental illness.

BACKGROUND: Primary care retention, defined as ongoing periodic contact with a consistent primary care provider, is beneficial for people with serious chronic illnesses. This study examined the effect of a Housing First intervention on primary care retention among homeless individuals with mental illness. METHODS: Two hundred individuals enrolled in the Toronto site of the At Home Project and randomized to Housing First or Treatment As Usual were studied. Medical records were reviewed to determine if participants were retained in primary care, defined as having at least one visit with the same primary care provider in each of two consecutive six-month periods during the 12 month period preceding and following randomization. RESULTS: Medical records were obtained for 47 individuals randomized to Housing First and 40 individuals randomized to Treatment As Usual. During the one year period following randomization, the proportion of Housing First and Treatment As Usual participants retained in primary care was not significantly different (38.3% vs. 47.5%, p = 0.39). The change in primary care retention rates from the year preceding randomization to the year following randomization was +10.6% in the Housing First group and -5.0% in the Treatment As Usual group. CONCLUSION: Among homeless individuals with mental illness, Housing First did not significantly affect primary care retention over the follow-up period. These findings suggest Housing First interventions may need to place greater emphasis on connecting clients with primary care providers.

Postpartum depression prevalence and risk factors among Indigenous, non-Indigenous and immigrant women in Canada.

OBJECTIVES: The social position of different minority groups in contemporary societies suggests different risk factors for postpartum depression (PPD). In this study, we used two cut-offs of the Edinburgh Postpartum Depression Scale (EPDS) to examine prevalence and risk factors for PPD among mothers participating in the Canadian Maternity Experiences Survey (MES), and to compare Indigenous, Canadian-born non-Indigenous and immigrant mothers. METHODS: We used cross-sectional nationwide data from the 2006 MES (unweighted N = 6237, weighted N = 74,231) and conducted multivariate logistic regression models for EPDS ≥ 10 and EPDS ≥ 13 to explore risk factors for the total sample of mothers and in each study group. RESULTS: Prevalence (%, 95 % CI) of EPDS ≥ 10 and EPDS ≥ 13 was significantly higher among immigrant (12.2 %, 10.2-14.2 and 24.1 %, 21.5-26.7) and Indigenous (11.1 %, 7.5-14.7 and 21.2 %, 16.5-25.9) compared to Canadian-born non-Indigenous mothers (5.6 %, 4.9-6.3 and 12.9 %, 11.9-13.9). Multivariate analysis of the total sample showed similar risk factors for EPDS ≥ 10 and EPDS ≥ 13 (ethnicity, low education, ≥ low income cut-off, taking antidepressants, experiencing abuse, low social support). Stratification by study group revealed differing risk factors in each group for EPDS ≥ 10 and EPDS ≥ 13. Indigenous mothers had the most distinct risk factors, followed by immigrant mothers. Non-indigenous Canadian-born mothers had risk factors most similar to the total sample. CONCLUSION: Differing prevalence and risk factors for PPD within and across study groups suggest that instead of a universal approach, tailored programs and services to prevent PPD in Indigenous, immigrant and non-Indigenous Canadian-born groups could better protect the mental health of Canadian mothers.

Primary care intervention to address cardiovascular disease medication health literacy among Indigenous peoples: Canadian results of a pre-post-design study.

CONTEXT: Cardiovascular diseases (CVD) are a leading cause of illness and death for Indigenous people in Canada and globally. Appropriate medication can significantly improve health outcomes for persons diagnosed with CVD or for those at high risk of CVD. Poor health literacy has been identified as a major barrier that interferes with client understanding and taking of CVD medication. Strengthening health literacy within health services is particularly relevant in Indigenous contexts, where there are systemic barriers to accessing literacy skills. OBJECTIVE: The aim of this study is to test the effect of a customized, structured health literacy educational program addressing CVD medications. METHODS: Pre-post-design involves health providers and Indigenous clients at the De dwa da dehs nye>s Aboriginal Health Centre (DAHC) in Ontario, Canada. Forty-seven Indigenous clients with or at high risk of CVD received three educational sessions delivered by a trained Indigenous nurse over a 4- to 7-week period. A tablet application, pill card and booklet supported the sessions. Primary outcomes were knowledge of CVD medications and health literacy practices, which were assessed before and after the programe. RESULTS: Following the program compared to before, mean medication knowledge scores were 3.3 to 6.1 times higher for the four included CVD medications. Participants were also more likely to refer to the customized pill card and booklet for information and answer questions from others regarding CVD. CONCLUSIONS: This customized education program was highly effective in increasing medication knowledge and health literacy practice among Indigenous people with CVD or at risk of CVD attending the program at an urban Indigenous health centre.

Our Health Counts Toronto: using respondent-driven sampling to unmask census undercounts of an urban indigenous population in Toronto, Canada.

OBJECTIVES: To provide evidence of the magnitude of census undercounts of 'hard-to-reach' subpopulations and to improve estimation of the size of the urban indigenous population in Toronto, Canada, using respondent-driven sampling (RDS). DESIGN: Respondent-driven sampling. SETTING: The study took place in the urban indigenous community in Toronto, Canada. Three locations within the city were used to recruit study participants. PARTICIPANTS: 908 adult participants (15+) who self-identified as indigenous (First Nation, Inuit or Métis) and lived in the city of Toronto. Study participants were generally young with over 60% of indigenous adults under the age of 45 years. Household income was low with approximately two-thirds of the sample living in households which earned less than $C20 000 last year. PRIMARY AND SECONDARY OUTCOME MEASURES: We collected baseline data on demographic characteristics, including indigenous identity, age, gender, income, household type and household size. Our primary outcome asked: 'Did you complete the 2011 Census Canada questionnaire?' RESULTS: Using RDS and our large-scale survey of the urban indigenous population in Toronto, Canada, we have shown that the most recent Canadian census underestimated the size of the indigenous population in Toronto by a factor of 2 to 4. Specifically, under conservative assumptions, there are approximately 55 000 (95% CI 45 000 to 73 000) indigenous people living in Toronto, at least double the current estimate of 19 270. CONCLUSIONS: Our indigenous enumeration methods, including RDS and census completion information will have broad impacts across governmental and health policy, potentially improving healthcare access for this community. These novel applications of RDS may be relevant for the enumeration of other 'hard-to-reach' populations, such as illegal immigrants or homeless individuals in Canada and beyond.

Predictors of Low-Acuity Emergency Department Use by Patients Enrolled in a Family Health Team.

BACKGROUND: The primary aim of this study was to determine the characteristics and develop a predictive model describing low acuity users of the emergency department (ED) by patients followed by a family health team (FHT). The secondary aim was to contrast this information with characteristics of high acuity users. We also sought to determine what factors were predictive of leaving without being seen (LWBS). METHODS: This retrospective descriptive correlational study explored characteristics and factors predictive of low acuity ED utilization. The sample included all FHT patients with ED visits in 2011. The last ED record was chosen for review. Sex, age, Canadian Triage and Acuity Scale (CTAS), presenting complaint(s), time of day, day of week, number of visits, and diagnosis were recorded. RESULTS: Of 1580 patients who visited the ED in 2011, 56% were CTAS 1-3 visits, 24% CTAS 4-5 and 20% had no CTAS recorded. Patients who were older than age 65 were approximately half as likely to have a CTAS level of 4-5 compared to younger patients (OR=0.605, CI=0.441,0.829). Patients older than age 65 were 1.75 times more likely to be CTAS level 1-2 (OR=1.745, CI=1.277, 2.383). Patients who went to the ED during the day were less likely to LWBS compared to night visits (OR=0.697, CI=0.532, 0.912). Interpretation Most low acuity ED utilization is by patients under the age of 65, while high acuity ED utilization is more common among patients older than age 65. Patients are more likely to LWBS during late evening and overnight periods (9 pm-7 am).

Barriers to Prescription Medication Adherence Among Homeless and Vulnerably Housed Adults in Three Canadian Cities.

OBJECTIVES: Medication adherence is an important determinant of successful medical treatment. Marginalized populations, such as homeless and vulnerably housed individuals, may face substantial barriers to medication adherence. This study aimed to determine the prevalence of, reasons for, and factors associated with medication nonadherence among homeless and vulnerably housed individuals. Additionally, we examined the association between medication nonadherence and subsequent emergency department utilization during a 1-year follow-up period. METHODS: Data were collected as part of the Health and Housing in Transition study, a prospective cohort study tracking the health and housing status of 595 homeless and 596 vulnerably housed individuals in 3 Canadian cities. Logistic regression was used to identify factors associated with medication nonadherence, as well as the association between medication nonadherence at baseline and subsequent emergency department utilization. RESULTS: Among 716 participants who had been prescribed a medication, 189 (26%) reported nonadherence. Being ≥40 years old was associated with decreased likelihood of nonadherence (adjusted odds ratio [AOR] = 0.59; 95% confidence interval [CI] = 0.41-0.84), as was having a primary care provider (AOR = 0.49; 95% CI = 0.34-0.71). Having a positive screen on the AUDIT (Alcohol Use Disorders Identification Test; an indication of harmful or hazardous drinking) was associated with increased likelihood of nonadherence (AOR = 1.86; 95% CI = 1.31-2.63). Common reasons for nonadherence included side effects, cost, and lack of access to a physician. Self-reported nonadherence at baseline was significantly associated with frequent emergency department use (≥3 visits) over the follow-up period at the bivariate level (OR = 1.55; 95% CI = 1.02-2.35) but was not significant in a multivariate model (AOR = 1.49; 95% CI = 0.96-2.32). CONCLUSION: Homeless and vulnerably housed individuals face significant barriers to medication adherence. Health care providers serving this population should be particularly attentive to nonadherence among younger patients and those with harmful or hazardous drinking patterns.

Impact of a Stewardship-Initiated Restriction on Empirical Use of Ciprofloxacin on Nonsusceptibility of Escherichia coli Urinary Isolates to Ciprofloxacin.

STUDY OBJECTIVE: To evaluate the impact of a stewardship-initiated restriction on empirical use of ciprofloxacin on the nonsusceptibility of Escherichia coli urinary isolates to ciprofloxacin over time while controlling for the use of other key antibiotics with gram-negative activity. DESIGN: Retrospective single-center study. SETTING: Large tertiary and quaternary care academic medical center. ISOLATES: Of 3714 E. coli urinary isolates. MEASUREMENTS AND MAIN RESULTS: The susceptibilities of the E. coli urinary isolates to ciprofloxacin, ceftriaxone, cefepime, piperacillin-tazobactam, meropenem, trimethoprim-sulfamethoxazole, and nitrofurantoin obtained over a 7-year period (January 1, 2006-December 31, 2012) from adult inpatients were evaluated for potential relationships with antibiotic use over time by using multiple variable regression analysis. After introduction of the restriction on empirical use of ciprofloxacin in the first quarter of 2011, ciprofloxacin use declined from 141.1-39.8 defined daily doses/1000 patient-days, and the percentage of E. coli isolates that were not susceptible to ciprofloxacin decreased from 41.5-32.8%. With all antibiotics evaluated included in the model, no apparent relationships were found between the percentage of E. coli isolates nonsusceptible to ciprofloxacin and antibiotic use. However, when nonsignificant variables were eliminated (p>0.20), ciprofloxacin use was found to be positively associated with the percentage of E. coli isolates nonsusceptible to ciprofloxacin (p=0.037), whereas ceftriaxone use was negatively associated (p=0.045). CONCLUSION: The restriction and subsequent reduction of ciprofloxacin use was found to have a positive effect on the susceptibility of E. coli urinary isolates to ciprofloxacin.

Factors associated with intimate partner violence by a former partner by immigration status and length of residence in Canada.

PURPOSE: We examined intimate partner violence (IPV) by a former partner among Canadian-born and immigrant women by length of residence in Canada. METHODS: Data from a 2009 national, population-based, telephone survey were used to determine the prevalence of and factors associated with any type of IPV (emotional, financial, physical, and/or sexual) by a former partner with whom there had been contact in the previous 5 years among immigrant women 0 to 19 years in Canada, 20 or more years or longer in Canada, and Canadian-born women (n = 1681). RESULTS: Of immigrant women in Canada for 0 to 19 years, 41.6% had experienced IPV by a former partner; for immigrant women in Canada for 20 or more years or longer, 60.6%, and Canadian-born women, 61.5% (P = .0423). In a logistic regression model adjusted for age and other sociodemographic characteristics, immigrant women in Canada for 0 to 19 years were less likely than Canadian-born women to experience any IPV (odds ratio, 0.266; 95% confidence interval, 0.130-0.544). There was no difference in the occurrence of any IPV between immigrant women in Canada 20 or more years or longer and Canadian-born women. CONCLUSIONS: High rates of any IPV by a former partner were found for both Canadian-born and immigrant women. Within immigrant communities, specific prevention campaigns should address the high risk of experiencing IPV at later stages of resettlement.