Examining Cases of Child Physical Abuse Evaluations to Identify Opportunities to Improve Intimate Partner Violence Screening in Pediatric Emergency Departments.

The association between child maltreatment and intimate partner violence (IPV) is well supported. Universal IPV screening has been recommended by the American Academy of Pediatrics and the United States Preventative Task Force, and many children's hospitals have established screening protocols. However, the yield and best screening method in families undergoing a child physical abuse (PA) evaluation have not been fully explored. To determine if there is a discrepancy in IPV disclosures between universal IPV screening completed during pediatric emergency department (PED) triage ("triage screening") and IPV screening by a social worker ("social work screening") in families of children who were evaluated for PA. Caregivers of children who presented to an urban tertiary PED and underwent an evaluation for PA via a child abuse pediatrics consult. A retrospective chart review was completed. Data collection included: caregiver responses to both triage screening and social work screening, interview setting details and participants, the child's injuries, and details of the family's reported IPV experiences. Our study (N = 329) revealed that social work screening produced significantly more positive IPV disclosures than triage screening (14.0% vs. 4.3%, p < .001). Additionally, non-IPV violence concerns were identified in 35.7% (n = 5) of the positive triage screens, whereas social work screens had none. These results highlight the benefits of IPV screening by social work in high-risk scenarios, such as child PA evaluations, regardless of universal IPV screening results. Exploring differences between the two screening methods can inform decisions about screening protocols to improve IPV identification in high-risk populations.

Epigenetic differences in stress response gene FKBP5 among children with abusive vs accidental injuries.

BACKGROUND: Survivors of child abuse experience high rates of adverse physical and mental health outcomes. Epigenetic alterations in the stress response system, the FKBP5 gene specifically, have been implicated as one mechanism that may link abuse to lifelong health issues. Prior studies primarily included older individuals with a remote history of maltreatment; our objective was to test for differential methylation of FKBP5 in children with abusive vs accidental injuries at the time of diagnosis. METHODS: We conducted a cross-sectional pilot study of acutely injured children <4 years old at two children's hospitals (n = 82). Research personnel collected injury histories, buccal swabs (n = 65), and blood samples (n = 25) to measure DNA methylation. An expert panel classified the injuries as abusive, accidental, or indeterminate. RESULTS: Children with abusive as compared to accidental injuries had lower methylation of the FKBP5 promoter in buccal and blood cells, even after controlling for injury severity, socioeconomic status, and psychosocial risk factors. CONCLUSION: These findings suggest that epigenetic variation in FKBP5 may occur at the earliest indication of abuse and may be associated with delayed resolution of the HPA axis stress response. Additional testing for epigenetic differences in larger sample sizes is needed to further verify these findings. IMPACT: Children (<4 years old) with abusive compared to accidental injuries showed lower methylation of the FKBP5 promoter in buccal and blood cells at the time of initial diagnosis even after controlling for injury severity, socioeconomic status, and psychosocial risk factors. Early childhood physical abuse may impact the epigenetic regulation of the stress response system, including demethylation within promoters and enhancers of the FKBP5 gene, even at the earliest indication of abuse. The findings are important because unmitigated stress is associated with adverse health outcomes throughout the life-course.

Pediatric Emergency Department Testing for Gonorrhea and Chlamydia in Children.

OBJECTIVE: This study aimed to describe trends in the utilization of nucleic acid amplification (NAAT) testing for gonorrhea and chlamydia in US pediatric emergency departments. Nucleic acid amplification has been recommended over genital culture by the American Academy of Pediatrics and Centers for Disease Control and Prevention for children evaluated for sexual abuse. METHODS: We conducted a multicenter study of children aged 12 months to 11 years tested for gonorrhea and chlamydia between 2004 and 2018 at 22 hospitals in the Pediatric Health Information System. We included patients diagnosed with maltreatment concerns and/or genitourinary (GU) symptoms. The primary outcome was prevalence of testing with NAAT, culture, or both. We analyzed groups based on patient sex, as well as diagnoses of maltreatment versus GU symptoms. RESULTS: A total of 36,312 visits were analyzed. Visits were 73.4% girls and 26.6% boys. During the study period, there was an increase in use of NAAT-only testing for girls (49.3% to 94.3%; P < 0.001) and boys (54.5% to 96.1%; P < 0.001). There was a decrease in use of culture alone for girls (40% to 1.6%; P < 0.001) and boys (38.7% to 0.8%; P < 0.001). Use of both tests in the same encounter was higher among children diagnosed with maltreatment than GU symptoms, regardless of sex (P < 0.001). CONCLUSIONS: Over a 14-year period, downtrend of culture use with increase in NAAT was observed, suggesting general adherence to evidence-based guidelines. Almost 10% of children diagnosed with maltreatment continued to be tested with culture. This could indicate provider concerns regarding test accuracy, legal admissibility, or lack of test availability.

Head biomechanics of video recorded falls involving children in a childcare setting.

The objective of this study was to characterize head biomechanics of video-recorded falls involving young children in a licensed childcare setting. Children 12 to < 36 months of age were observed using video monitoring during daily activities in a childcare setting (in classrooms and outdoor playground) to capture fall events. Sensors (SIM G) incorporated into headbands worn by the children were used to obtain head accelerations and velocities during falls. The SIM G device was activated when linear acceleration was ≥ 12 g. 174 video-recorded falls activated the SIM G device; these falls involved 31 children (mean age = 21.6 months ± 5.6 SD). Fall heights ranged from 0.1 to 1.2 m. Across falls, max linear head acceleration was 50.2 g, max rotational head acceleration was 5388 rad/s2, max linear head velocity was 3.8 m/s and max rotational head velocity was 21.6 rad/s. Falls with head impact had significantly higher biomechanical measures. There was no correlation between head acceleration and fall height. No serious injuries resulted from falls-only 1 child had a minor injury. In conclusion, wearable sensors enabled characterization of head biomechanics during video-recorded falls involving young children in a childcare setting. Falls in this setting did not result in serious injury.

External Validation of the PediBIRN Screening Tool for Abusive Head Trauma in Pediatric Emergency Department Settings.

METHODS: We conducted a retrospective, secondary analysis of an existing, deidentified, prospective data set captured to derive a bruising CDR. Subjects were patients under 3 years with bruising and confirmed acute head trauma. An expert medical panel had previously identified patients with AHT. Measures of the CDR's AHT screening performance (sensitivity, specificity, likelihood ratios) were calculated with 95% confidence intervals (CIs). RESULTS: Expert medical panel members had classified 78 of 117 eligible patients (67%) as AHT, 38 (33%) as non-AHT, and 1 as indeterminate. Excluding the indeterminate case, the PediBIRN-4 demonstrated a sensitivity of 0.96 (95% CI, 0.88-0.99), specificity of 0.29 (95% CI, 0.16-0.46), positive likelihood ratio of 1.35 (95% CI, 1.10-1.67), and negative likelihood ratio of 0.13 (95% CI, 0.04-0.46). Close inspection of the data revealed that 1 of the CDR's predictor variables had lowered specificity without impacting sensitivity. Eliminating this variable would have increased specificity to 0.84 (95% CI, 0.68-0.93). CONCLUSIONS: The PediBIRN 4-variable CDR demonstrated AHT screening sensitivity in the pediatric ED equivalent to pediatric intensive care unit and other inpatient settings, but lower specificity. Further study of a simplified 3-variable PediBIRN AHT screening tool for the ED setting is warranted.

Femur morphology in healthy infants and young children.

The objective of this study was to characterize femur morphology in healthy infants and young children. Anterior-posterior (AP) radiographs of the femur from children age 0-3 years with no history of bone disease were obtained from two children's hospitals and one medical examiner's office. Femur morphological measures (bone length, minimum diaphysis diameter, growth plate width, and femur radius of curvature) and sectional structural measures were determined. Measures were described and compared based on subject age and mass. Relationships between measures and age and mass were evaluated. The 169 AP femur radiographs were obtained from 99 children (59.6% males, median age = 12.0 months, IQR = 0-27.5 months, median body weight = 10.0 kg, IQR = 4.4-15.6 kg). Femur length (rs  = 0.97, p < 0.001; rs  = 0.89, p < 0.001), trochanter width (rs  = 0.86, p < 0.001; rs  = 0.85, p < 0.001), minimum diaphysis diameter (rs  = 0.91, p < 0.001; rs  = 0.87, p < 0.001), and growth plate width (rs  = 0.91, p < 0.001; rs  = 0.84, p < 0.001) increased with age and weight, respectively. Cross-sectional area (rs  = 0.87; rs  = 0.86; p < 0.01), polar moment of inertia (rs  = 0.91; rs  = 0.87; p < 0.001), moment of inertia (rs  = 0.91; rs  = 0.87; p < 0.001), polar modulus (rs  = 0.91; rs  = 0.87; p < 0.001) and medullary canal diameter (rs  = 0.83, p < 0.001; rs  = 0.73, p < 0.001) at the minimum diaphysis also increased with age and weight, respectively. Changes during rapid bone growth are important to understanding fracture risk in infants and young children as they transition to independent walking. Femur length, trochanter width, minimum diaphysis diameter and growth plate width increased with age and weight. Structural properties associated with fracture resistance also increased with age and weight.

Validation of a Clinical Decision Rule to Predict Abuse in Young Children Based on Bruising Characteristics.

Importance: Bruising caused by physical abuse is the most common antecedent injury to be overlooked or misdiagnosed as nonabusive before an abuse-related fatality or near-fatality in a young child. Bruising occurs from both nonabuse and abuse, but differences identified by a clinical decision rule may allow improved and earlier recognition of the abused child. Objective: To refine and validate a previously derived bruising clinical decision rule (BCDR), the TEN-4 (bruising to torso, ear, or neck or any bruising on an infant <4.99 months of age), for identifying children at risk of having been physically abused. Design, Setting, and Participants: This prospective cross-sectional study was conducted from December 1, 2011, to March 31, 2016, at emergency departments of 5 urban children's hospitals. Children younger than 4 years with bruising were identified through deliberate examination. Statistical analysis was completed in June 2020. Exposures: Bruising characteristics in 34 discrete body regions, patterned bruising, cumulative bruise counts, and patient's age. The BCDR was refined and validated based on these variables using binary recursive partitioning analysis. Main Outcomes and Measures: Injury from abusive vs nonabusive trauma was determined by the consensus judgment of a multidisciplinary expert panel. Results: A total of 21 123 children were consecutively screened for bruising, and 2161 patients (mean [SD] age, 2.1 [1.1] years; 1296 [60%] male; 1785 [83%] White; 1484 [69%] non-Hispanic/Latino) were enrolled. The expert panel achieved consensus on 2123 patients (98%), classifying 410 (19%) as abuse and 1713 (79%) as nonabuse. A classification tree was fit to refine the rule and validated via bootstrap resampling. The resulting BCDR was 95.6% (95% CI, 93.0%-97.3%) sensitive and 87.1% (95% CI, 85.4%-88.6%) specific for distinguishing abuse from nonabusive trauma based on body region bruised (torso, ear, neck, frenulum, angle of jaw, cheeks [fleshy], eyelids, and subconjunctivae), bruising anywhere on an infant 4.99 months and younger, or patterned bruising (TEN-4-FACESp). Conclusions and Relevance: In this study, an affirmative finding for any of the 3 BCDR TEN-4-FACESp components in children younger than 4 years indicated a potential risk for abuse; these results warrant further evaluation. Clinical application of this tool has the potential to improve recognition of abuse in young children with bruising.

Long bone fracture characteristics in children with medical conditions linked to bone health.

BACKGROUND: Knowledge of fracture characteristics among children with medical conditions affecting bone could help to distinguish medical causes from child abuse. OBJECTIVE: Characterize long bone fracture morphology among children diagnosed with medical conditions linked to bone health. PARTICIPANTS AND SETTING: Patients <18 years at a single pediatric hospital diagnosed with a medical condition linked to bone health and ≥1 long bone fracture were studied. METHODS: This retrospective medical record review categorized underlying medical diagnoses as: metabolic bone disease, genetic disorder of connective tissue, neurologic disorder and other chronic disease. A pediatric radiologist reviewed plain films to determine fracture type and location. Descriptive statistics, as well as logistic regression were used to compare fracture types by clinical characteristics. RESULTS: Ninety-four patients were included and their diagnoses were genetic connective disorder (19; 20.2 %), metabolic bone disease (16; 17.0 %), neurologic disorder (27; 28.7 %), and other (32; 34.0 %). A total of 216 long bone fractures were sustained; 52.1 % of children had >1 long bone fracture. Of the 216 fractures, 55 (25.5 %) were in children < 1 year, 118 (54.6 %) were associated with known trauma, and 122 (56.5 %) were in non-ambulatory patients. Lower extremity fractures occurred with greatest frequency and most fractures occurred at the mid-diaphysis. Transverse was the most common fracture type in all diagnostic categories. Children with metabolic disorders had highest odds of transverse fracture (COR 3.55, CI 1.45-8.67; neurologic disorders as reference group). CONCLUSIONS: Diseases affecting bone health can influence fracture morphology. Transverse fractures were most common in bones impacted by disease.

Who's Watching the Children? Caregiver Features Associated with Physical Child Abuse versus Accidental Injury.

OBJECTIVE: To compare caregiver features and caregiving arrangements of children with physical abuse vs accidental injuries. STUDY DESIGN: Data came from a prospective, observational, multicenter study investigating bruising and psychosocial characteristics of children younger than 4 years of age. Using logistic regression, we examined how abuse vs accidental injury and severity of injury were associated with caregiver sex, relation to the child, whether caregiving arrangements were different than usual at the time of injury, and length of the main caregiver's relationship with his/her partner. RESULTS: Of 1615 patients, 24% were determined to have been physically abused. Abuse was more likely when a male caregiver was present (OR 3.31, 95% CI 2.38-4.62). When the male was the boyfriend of the mother (or another female caregiver), the odds of abuse were very high (OR 169.2, 95% CI 61.3-614.0). Severe or fatal injuries also were more likely when a male caregiver was present. In contrast, abuse was substantially less likely when a female caregiver was present (OR 0.25, 95% CI 0.17-0.37) with the exception of a female babysitter (OR 3.87, 95% CI 2.15-7.01). Caregiving arrangements that were different than usual and caregiver relationships <1 year were also associated with an increased risk of abuse. CONCLUSIONS: We identified caregiver features associated with physical abuse. In clinical practice, questions regarding caregiver features may improve recognition of the abused child. This information may also inform future abuse prevention strategies.

Classifying Injuries in Young Children as Abusive or Accidental: Reliability and Accuracy of an Expert Panel Approach.

OBJECTIVE: To assess interrater reliability and accuracy of an expert panel in classifying injuries of patients as abusive or accidental based on comprehensive case information. STUDY DESIGN: Data came from a prospective, observational, multicenter study investigating bruising characteristics of children younger than 4 years. We enrolled 2166 patients with broad ranges of illnesses and injuries presenting to one of 5 pediatric emergency departments in whom bruises were identified during examination. We collected comprehensive data regarding current and past injuries and illnesses, and provided deidentified, standardized case information to a 9-member multidisciplinary panel of experts with extensive experience in pediatric injury. Each panelist classified cases using a 5-level ordinal scale ranging from definite abuse to definite accident. Panelists also assessed whether report to child protective services (CPS) was warranted. We calculated reliability coefficients for likelihood of abuse and decision to report to CPS. RESULTS: The interrater reliability of the panelists was high. The Kendall coefficient (95% CI) for the likelihood of abuse was 0.89 (0.87, 0.91) and the kappa coefficient for the decision to report to CPS was 0.91 (0.87, 0.94). Reliability of pairs and subgroups of panelists were similarly high. A panel composite classification was nearly perfectly accurate in a subset of cases having definitive, corroborated injury status. CONCLUSIONS: A panel of experts with different backgrounds but common expertise in pediatric injury is a reliable and accurate criterion standard for classifying pediatric injuries as abusive or accidental in a sample of children presenting to a pediatric emergency department.

Are negative/unrealistic parent descriptors of infant attributes associated with physical abuse?

Parents' perceptions of child behavior influence their responses to the child and may be important predictors of physical abuse. We examined whether infants 12 months of age or younger who were described with negative or developmentally unrealistic words were more likely than other infants to have been physically abused. As part of a prospective observational multicenter study investigating bruising and familial psychosocial characteristics, parents were asked to (1) describe their child's personality, and (2) list three words to describe their child. Four independent raters coded parent responses using a qualitative content analysis, identifying descriptors of infants and classifying each as positive, neutral, or negative/unrealistic. A medical expert panel, blinded to the psychosocial data, separately categorized each case as abuse or accident. We then analyzed the potential association between negative/unrealistic descriptors and abusive injury. Of 185 children enrolled, 147 cases (79%) were categorized as accident and 38 (21%) as abuse. Parents used at least one negative/unrealistic descriptor in 35/185 cases (19%), while the remaining 150 cases (81%) included only positive or neutral descriptors. Of the infants described with negative/unrealistic words, 60% were abused, compared to 11% of those described with positive or neutral words (p < .0001; age group-adjusted OR = 9.95; 95% confidence interval [3.98, 24.90]). Though limited by sample-size, this pilot study informs future work to create a screening tool utilizing negative/unrealistic descriptors in combination with other predictive factors to identify infants at high risk for physical child abuse.

Femur fracture biomechanics and morphology associated with torsional and bending loading conditions in an in vitro immature porcine model.

PURPOSE: The objectives of this study were to describe fracture morphology resulting from common loading mechanisms such as bending and torsion in immature bone and to identify differences in the energy required to produce various fracture types under these two loading mechanisms using an immature porcine animal model. METHODS: Twenty-six in vitro immature porcine femora were mechanically tested in 3-point-bending and torsion. Femur specimens were tested with and without soft tissue and at both quasi-static and dynamic loading rates. Bone geometry and density measures were determined for each femur using dual-energy x-ray absorptiometry and plain film x-rays. Failure load, stiffness, and energy to failure were determined for each specimen from the load-displacement history from mechanical tests. RESULTS: 3-point bending tests resulted in 10 transverse fractures and 2 oblique fractures. Torsion tests resulted in spiral fractures. Mean energy required to produce transverse fractures (3.32 Nm) was double that associated with spiral fractures (1.66 Nm). In bending, specimens with soft tissue intact required significantly greater energy to fracture (4.40 Nm) than specimens with soft tissue removed (2.92 Nm). Torsional loading rate did not significantly affect energy to fracture. CONCLUSIONS: Fracture morphology is dependent upon loading conditions. Energy to failure allows for comparison across various loading conditions, and thus offers an effective means of characterizing fracture thresholds for a wide range of scenarios. Consideration should be given to whether or not soft tissue is left intact when conducting experiments using whole bone specimens given its influence on energy to failure.

Dataset on psychosocial risk factors in cases of fatal and near-fatal physical child abuse.

This article presents the psychosocial risk factors identified in the cases of 20 children less than four years of age who were victims of fatal or near-fatal physical abuse during a 12 month period in the Commonwealth of Kentucky. These data are related to the article "History, injury, and psychosocial risk factor commonalities among cases of fatal and near-fatal physical child abuse" (Pierce et al., 2017) [1].

History, injury, and psychosocial risk factor commonalities among cases of fatal and near-fatal physical child abuse.

Failure to recognize child maltreatment results in chronic exposure to high-risk environments where re-injury or death may occur. We analyzed a series (n=20) of fatal (n=10) and near-fatal (n=10) physical child abuse cases from the Commonwealth of Kentucky to identify commonalities and determine whether indicators of maltreatment were present prior to the child's fatal or near-fatal event. We conducted retrospective state record reviews involving children <4years of age classified as physical child abuse by the Cabinet for Health and Family Services during a 12 month period. Cases were distributed across 17 counties. IRB approvals were obtained. Three reviewers concurrently abstracted case data from medical, social, and legal documents, and descriptive statistics were analyzed. Median age of subjects was 7.5 months (range 1-32 months); 55% were male. Psychosocial risk factors (PRFs) were present in 100% of cases. Traumatic brain injury (95%) and bruising (90%) were the most common injuries. Of the 14 children with available prior medical records, 9 (64%) had sentinel injuries in the form of prior unexplained bruising; all nine suffered subsequent traumatic brain injury resulting in four deaths. A male was caring for the child at the time of the final event in 70% of cases. Our study identified key commonalities across cases of fatal and near-fatal abuse, highlighting the prevalence of psychosocial risk factors and the significance of prior unexplained bruising as a herald of escalating abuse. Further study is warranted to ascertain the predictive value of our findings in the larger population.

Derivation and Validation of a Serum Biomarker Panel to Identify Infants With Acute Intracranial Hemorrhage.

Importance: Abusive head trauma is the leading cause of death from physical abuse. Missing the diagnosis of abusive head trauma, particularly in its mild form, is common and contributes to increased morbidity and mortality. Serum biomarkers may have potential as quantitative point-of-care screening tools to alert physicians to the possibility of intracranial hemorrhage. Objective: To identify and validate a set of biomarkers that could be the basis of a multivariable model to identify intracranial hemorrhage in well-appearing infants using the Ziplex System. Design, Setting, and Participants: Binary logistic regression was used to develop a multivariable model incorporating 3 serum biomarkers (matrix metallopeptidase-9, neuron-specific enolase, and vascular cellular adhesion molecule-1) and 1 clinical variable (total hemoglobin). The model was then prospectively validated. Multiplex biomarker measurements were performed using Flow-Thru microarray technology on the Ziplex System, which has potential as a point-of-care system. The model was tested at 3 pediatric emergency departments in level I pediatric trauma centers (Children's Hospital of Pittsburgh of University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania; Primary Children's Hospital, Salt Lake City, Utah; and Lurie Children's Hospital, Chicago, Illinois) among well-appearing infants who presented for care owing to symptoms that placed them at increased risk of abusive head trauma. The study took place from November 2006 to April 2014 at Children's Hospital of Pittsburgh, June 2010 to August 2013 at Primary Children's Hospital, and January 2011 to August 2013 at Lurie Children's Hospital. Main Outcomes and Measures: A mathematical model that can predict acute intracranial hemorrhage in infants at increased risk of abusive head trauma. Results: The multivariable model, Biomarkers for Infant Brain Injury Score, was applied prospectively to 599 patients. The mean (SD) age was 4.7 (3.1) months. Fifty-two percent were boys, 78% were white, and 8% were Hispanic. At a cutoff of 0.182, the model was 89.3% sensitive (95% CI, 87.7-90.4) and 48.0% specific (95% CI, 47.3-48.9) for acute intracranial hemorrhage. Positive and negative predictive values were 21.3% and 95.6%, respectively. The model was neither sensitive nor specific for atraumatic brain abnormalities, isolated skull fractures, or chronic intracranial hemorrhage. Conclusion and Relevance: The Biomarkers for Infant Brain Injury Score, a multivariable model using 3 serum biomarker concentrations and serum hemoglobin, can identify infants with acute intracranial hemorrhage. Accurate and timely identification of intracranial hemorrhage in infants without a history of trauma in whom trauma may not be part of the differential diagnosis has the potential to decrease morbidity and mortality from abusive head trauma.

Research priorities for a multi-center child abuse pediatrics network - CAPNET.

Although child maltreatment medical research has benefited from several multi-center studies, the new specialty of child abuse pediatrics has not had a sustainable network capable of pursuing multiple, prospective, clinically-oriented studies. The Child Abuse Pediatrics Network (CAPNET) is a new multi-center research network dedicated to child maltreatment medical research. In order to establish a relevant, practical research agenda, we conducted a modified Delphi process to determine the topic areas with highest priority for such a network. Research questions were solicited from members of the Ray E. Helfer Society and study authors and were sorted into topic areas. These topic areas were rated for priority using iterative rounds of ratings and in-person meetings. The topics rated with the highest priority were missed diagnosis and selected/indicated prevention. This agenda can be used to target future multi-center child maltreatment medical research.

Is the Use of Physical Discipline Associated with Aggressive Behaviors in Young Children?

OBJECTIVE: To determine the association between use of physical discipline and parental report of physically aggressive child behaviors in a cohort of young children who were without indicators of current or past physical abuse. METHODS: The data for this study were analyzed from an initial cohort of patients enrolled in a prospective, observational, multicenter pediatric emergency department-based study investigating bruising and familial psychosocial characteristics of children younger than 4 years of age. Over a 7-month period, structured parental interviews were conducted regarding disciplinary practices, reported child behaviors, and familial psychosocial risk factors. Children with suspected physical abuse were excluded from this study. Trained study staff collected data using standardized questions. Consistent with grounded theory, qualitative coding by 2 independent individuals was performed using domains rooted in the data. Inter-rater reliability of the coding process was evaluated using the kappa statistic. Descriptive statistics were calculated and multiple logistic regression modeling was performed. RESULTS: Three hundred seventy-two parental interviews were conducted. Parents who reported using physical discipline were 2.8 (95% confidence interval [CI], 1.7-4.5) times more likely to report aggressive child behaviors of hitting/kicking and throwing. Physical discipline was used on 38% of children overall, and was 2.4 (95% CI, 1.4-4.1) times more likely to be used in families with any of the psychosocial risk factors examined. CONCLUSIONS: Our findings indicated that the use of physical discipline was associated with higher rates of reported physically aggressive behaviors in early childhood as well as with the presence of familial psychosocial risk factors.