C. J. Johnson

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Although understanding of the subsistence patterns, service utilization, and HIV-risk behaviors of homeless youths and young adults in increasing, relatively little is known about the epidemiology of mental health problems in this group or the relationships between mental health problems and substance use. This study measured symptoms of depression, low(More)
Research was conducted to identify subcultural peer groups within a homeless youth population and determine whether these groups differ with respect to drug use patterns and HIV risk. Using systematic sampling methods, 309 homeless youth (ages 13–23 years) were recruited from street and service sites. Drug use patterns and HIV risk profiles were found to(More)
INTRODUCTION Injuries are a leading cause of morbidity among pregnant women. We compared injuries among pregnant women and all women of reproductive age in a large defined population. METHODS Maryland hospital discharge data files from 1979-1990 were used to identify injuries in pregnant women and in all women 15-44 years of age. Injured pregnant women(More)
Little has been published on the risks of participating in an expedition. A questionnaire survey was conducted to quantify those risks and to determine how expedition organizers plan for medical mishaps. 246 expeditions, taking 2381 participants to more than one hundred countries, were studied retrospectively. 65 expeditions (26%) reported no medical(More)
The ease of picture naming in children was assessed as a function of two stimulus characteristics: (a) the number of available correct names for a picture (referential uncertainty) and (b) the degree to which a picture realistically represents the depicted object (stimulus realism). Two experiments employing different methods demonstrated that: (a) children(More)
The cell BE design methodology is described which enables high frequency, high performance, power efficient, and area optimized design. It includes a hierarchical design style, clean clock boundary, effective use of non-scan latches, at-speed scan testing, custom design like synthesized macro, fine grained clock gating scheme, and cycle accurate power(More)
Self-disclosure of HIV infection was examined among 105 African-American men and 264 European-American men sampled randomly at two outpatient HIV clinics in Los Angeles. After statistically controlling for potentially confounding factors, it was found that the African-Americans were less likely to disclose their serostatus to intimate lovers, close friends,(More)
PRIMARY OBJECTIVE To present a new measure, the Functional Assessment of Verbal Reasoning and Executive Strategies (FAVRES), with evidence for its reliability and validity in a normative study. The FAVRES is designed to evaluate the subtle cognitive-communication deficits of individuals with ABI. METHODS AND PROCEDURES The FAVRES consists of four complex,(More)
INTRODUCTION The prevalence with which firearms are stored loaded or unlocked has been measured in previous surveys. Our purpose was to compare household firearm storage practices reported by firearm users and nonusers. METHODS We analyzed telephone survey data from the 1992 and 1993 Oregon Behavioral Risk Factor Surveillance System on 2454 randomly(More)