Vincent Dufort

Adverse Behavioral and Emotional Outcomes from Child Abuse and Witnessed Violence

This article examines mental health outcomes of children who have witnessed violence in their social environment and/or have been physically abused. Participants (n = 167) come from a longitudinal study on child maltreatment. Outcomes—including depression, anger, and anxiety—are measured by the Child Behavior Checklist and the Trauma Symptom Checklist for Children. The authors used adjusted multivariate analyses to test the statistical significance of associations. The majority of children were female (57%) and non-White (64%). One third had been physically victimized; 46% had witnessed moderate-high levels of violence. Results confirm that children are negatively affected by victimization and violence they witness in their homes and neighborhoods. Victimization was a significant predictor of child aggression and depression; witnessed violence was found to be a significant predictor of aggression, depression, anger, and anxiety. Implications will be discussed.

School performance in a longitudinal cohort of children at risk of maltreatment

Objective: Previous research has suggested that child maltreatment is associated with poor school performance. However, previous studies have largely been cross-sectional or, if longitudinal, have had small sample sizes, short follow-up periods, or have not adequately controlled for confounders. The objective of this study is to determine the relationship between child maltreatment and school performance in a cohort of children at risk of maltreatment and followed since birth. Method: This prospective study followed children born at risk for maltreatment with semi-annual reviews of the North Carolina Central Registry of Child Abuse and Neglect. At ages six and eight years, childrens teachers were surveyed using the Achenbach Teacher Report Form and project-developed questions regarding peer status. This information, along with control variables from maternal interviews, was used in logistic regression models to determine the impact of maltreatment on academic performance, peer status, and adaptive functioning. The generalized estimating equations (GEE) method was applied to adjust variance estimates for within-person correlations of school performance measures at two points in time. Results: A substantiated maltreatment report is significantly associated with poorer academic performance (p < 0.01) and poorer adaptive functioning (p < 0.001) but not with peer status. Conclusions: Understanding the consequences of maltreatment, including poor academic performance and adaptive functioning, is important in planning educational, health, and social service interventions that may help abused or neglected children succeed in school and later in life. Longitudinal analysis is the best way to establish a causal relationship between maltreatment and subsequent school problems.

Case-cohort analysis of brain cancer and leukemia in electric utility workers using a refined magnetic field job-exposure matrix

BACKGROUND The potential association between occupational electric and magnetic field exposure and cancer is well documented in the literature, but there is uncertainty regarding a causal relation. METHODS Using data from a completed cohort study, we sought to refine the job-exposure matrix in a case-cohort analysis by regrouping jobs into more homogeneous groups, but without making additional measurements. From the original cohort, we selected the 164 men who died of leukemia, 145 men who died of brain cancer, and a random subcohort of 800 men (0.6% of the cohort). Erroneous job assignments were corrected and job groups were subdivided based on differences in work environments or tasks performed. RESULTS Magnetic field exposure remained unrelated to leukemia mortality and positively associated with brain cancer mortality based on both cumulative and average magnetic field indices. Although not monotonic across the middle intervals, increased risk of brain cancer was found in relation to career exposure, with risk ratios of 1.8 (95% CI = 0.7-4.7) and 2.5 (95% CI = 1.0-6.3) in the uppermost categories for cumulative and average exposure, stronger for exposure 2-10 years past. CONCLUSIONS Improvements in exposure assignment based only on reassignment of job titles to occupational categories had little impact on the measured associations of magnetic fields with leukemia or brain cancer.

Injuries among children in home and out-of-home care.

As the number of children receiving care in out-of-home settings increases in the United States, the risk of injury in such settings has become the subject of intense research. OBJECTIVES: This study examined the relative safety of out-of-home care compared with care in a childs own home. METHODS: This community based prospective cohort study of 656 families in three adjacent counties in the Piedmont region of North Carolina characterizes the patterns and rates of injuries among children less than 5 years of age in three child care settings, home care (HC), center based care (CBC), and other out-of-home care (OOHC). Information about minor and severe injuries was obtained from parents using monthly telephone interviews over a one year period. Statistical modeling designed to handle unbalanced data with correlated observations was used as the primary tool for analysis. RESULTS: Rate of minor injuries was highest in CBC, followed by HC, and then OOHC. However, these differences for OOHC may have been due to reporting biases and errors in rate estimates. There were no significant differences in severe injury rates among the three settings. CONCLUSIONS: The risk of serious injury among children under 5 in CBC is not different from that of children in HC or OOHC despite the fact that the risk of minor injury is higher.

Fatal occupational injuries among electric power company workers.

Surveillance data suggest high rates of electrocutions and fatal falls among workers in electric utility companies, who may be exposed to electric current, heights, flammable agents, and frequent motor vehicle travel. To characterize the occurrence of fatal injuries among electric utility workers, we studied workers in five electric power companies in the United States. A cohort of 127,129 men hired between 1950 and 1986 was followed through 1988. Injuries at work were identified through manual review of death certificates. The occurrence of occupational injuries was analyzed with directly adjusted rates and Poisson regression. The overall rate of fatal occupational injuries was 13.20 per 100,000 person-years (n = 192), with 76% due to electric current, homicide, and falls from heights. Deaths were concentrated in a few groups with elevated injury rates, notably linemen (rate ratio (RR) 3.33), electricians (RR 2.79), and painters (RR 3.27). Occupations requiring daily work on elevations or frequent, direct contact with energized electrical equipment experienced markedly higher rates of fatal injury from falls and electrocutions with rate ratios of 21.8 (95% confidence interval (CI) 11.4-41.5) and 16.7 (95% CI 6.6-42.6), respectively, independent of worker age and seniority. Although fatal injury rates in this industry have declined in recent decades, significant numbers of deaths still occur. Based on the premise that all injuries are preventable, a need for continued vigilance and efforts at prevention is indicated.

Lung cancer in relation to employment in the electrical utility industry and exposure to magnetic fields.

OBJECTIVES: A recent study found that lung cancer may be associated with exposures encountered in the electrical utility industry. To further evaluate this possibility, data were collected and analysed from five large electrical utility companies in the United States. METHODS: A cohort of 138905 male workers employed between 1950 and 1986 was followed up for mortality to the end of 1988, with 20733 deaths identified of which 1692 were due to lung cancer. Mortality from lung cancer was examined in relation to the duration of employment in specific jobs thought to have high exposure to 60 Hz magnetic fields and to an index of cumulative exposure to magnetic fields based on personal measurements. Exposure to pulsed electromagnetic fields (PEMFs) as estimated from another study was also considered. Poisson regression generated rate ratios for categories of exposure based on comparisons within the cohort adjusted for age, calendar year, race, socioeconomic status, work status, and estimated exposure to asbestos. RESULTS: Mortality rose modestly with duration of work as an electrician or power plant operator reaching rate ratios of 1.4 with > or = 20 years in those jobs but not with duration of work as a lineman or a combination of jobs thought to have high exposures to 60 Hz magnetic fields or PEMFs. Cumulative indices of exposure to 60 Hz magnetic fields and PEMFs were both associated with rate ratios of 1.2-1.3 in the highest intervals. CONCLUSIONS: These data suggest that lung cancer is not strongly associated with duration of employment in specific jobs associated with high potential exposure to 60 Hz magnetic fields or to PEMFs. Small associations of lung cancer with indices of both 60 Hz magnetic fields and PEMFs leave open the possibility that larger associations have been diluted through exposure misclassification. Refined exposure assessment, especially to PEMFs, would be required to evaluate that possibility.

Occupational injuries among adolescents in Dunedin, New Zealand, 1990-1993.

STUDY OBJECTIVE In this study we describe occupational injuries among adolescents (ages 15 through 19 years) presenting at a hospital ED in Dunedin, New Zealand, 1990-1993. METHODS We used a new database to identify work-related injuries, as well as type of injury, cause of injury, injury site, occupation, industry, age, and sex. RESULTS During the 4 years of the study, 1,361 work-related injuries were treated at the ED, for an injury rate of 13.8 per 200,000 hours worked (100 full-time equivalents). Males had a rate of 20.6 injuries, females 5.8 injuries, per 200,000 hours. Compared with injury rates from other studies, rates were lower than, but reasonably comparable to, those rates estimated through more detailed surveys. Main injury sites included upper extremities (mostly hands), head (mostly eyes), and lower extremities. Laceration was the main type of injury, followed by sprain/strain and foreign body. External cause of injury was mainly cutting/piercing objects, followed by foreign body and being struck by or against an object. The rate was highest for the 16- and 17-year-olds and decreased for 18- and 19-year-olds. The rates of injuries in the construction sector were the highest of all occupational groups, at 27 injuries per 200,000 hours, followed by transportation/ communication, manufacturing (including meat and fish processing), and business and repair services. Laborers were the highest occupational risk group, with 36 injuries per 200,000 hours, followed by machine operators, precision production workers, and service workers. CONCLUSION These findings may be helpful in focusing prevention efforts in high-incidence areas. This study demonstrates how a well-planned data-collection system can overcome some of the previously described difficulties of getting prevention-oriented information from EDs.