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The goal of this study is to determine the prevalence and age of onset of Diagnostic and Statistical Manual of Mental Disorders (4th ed.; DSMIV; American Psychiatric Association, 1994) and latent class-derived attention deficit/hyperactivity disorder (ADHD) subtypes in a population-based twin sample of boys and girls. Missouri birth records identified families with a twin pair 7 to 18 years of age. Telephone screening interviews for ADHD symptoms were completed for 5007 families. Diagnostic assessments were administered to 564 families with at least one twin meeting screening criteria, plus 183 control families. Prevalence and age of onset for both ADHD nosologies were calculated by sex and zygosity from parent report data. The prevalence of any DSM-IV ADHD was 6.2% overall, 7.4% in boys and 3.9% in girls. The inattentive subtype was most common in boys; the combined subtype was most common in girls. The mean age of onset of symptoms in children with any DSM-IV ADHD was 3.5 years, with no significant differences between boys and girls. Prevalences of latent class defined ADHD subtypes also varied by sex with the severe inattentive and combined classes more common in boys than girls. The age of onset of symptoms did not differ between boys and girls but were higher than in the DSM-IV subtypes. Findings in this twin sample showed that clinically significant ADHD, defined by either DSM-IV or latent class criterion, has an early age of onset and is more common in boys than girls. As clinical samples are most commonly composed of male combined subtypes, the inattentive subtype of both sexes in the general population is an under- treated segment of the general population.

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Background: Falls are common in older people. The fear of falling (FOF) can lead elderly persons to restrict their activities which reduces quality of life. We aimed to estimate the prevalence and factors associated with FOF in community-dwelling Thai elderly to improve screening, treatment and prevention policies and practices. Objectives: We aimed to estimate the prevalence and factors associated with FOF in suburban-dwelling Thai seniors. Methods: Seniors aged 60–85 years old from 4 suburban communities near Bangkok, Thailand, were interviewed and examined. Questionnaires were used to collect data on the FOF, symptoms of depression, anxiety and balance tests. T tests, χ2 tests, and logistic regressions were used in statistical analysis. Results: 210 subjects were enrolled. The mean age was 70.3, and 74.3% were female. Fifty-three (25.2%) reported a previous history of falls. The prevalence of FOF was 35.8% in the subjects with previous history of falls and 21.7% in subjects without previous history of falls. FOF was associated with female gender, age ≥80, living alone, impaired balance, and functional impairment but not with previous history of falls. Conclusion: FOF is associated with balance impairment, anxiety, depression, and functional impairment of daily routine activities.