Network


Latest external collaboration on country level. Dive into details by clicking on the dots.

Hotspot


Dive into the research topics where Ned Carter is active.

Publication


Featured researches published by Ned Carter.


Movement Disorders | 2001

Prevalence of restless legs syndrome among men aged 18 to 64 years: An association with somatic disease and neuropsychiatric symptoms

Jan Ulfberg; Birgitta Nyström; Ned Carter; Christer Edling

Standardized diagnostic criteria determined by the International Restless Legs Syndrome Study Group were used to investigate the current prevalence of restless legs syndrome (RLS). Possible associations between RLS and neuropsychiatric and somatic complaints were also investigated. A random sample of 4,000 men living in central Sweden were sent a questionnaire that included questions about sleep habits, symptoms of sleepiness, and somatic and neuropsychiatric complaints. Four symptom questions accepted as minimal diagnostic criteria for RLS were also included. Odds (OR) ratios and 95% confidence interval (CI) for different variables were calculated by means of multivariate logistic regression; 5.8% of the men suffered from RLS. The prevalence of RLS increased with age. Sleep‐related complaints were more frequent among the RLS sufferers. Complaints of headache at awakening and daytime headache were reported three to five times more frequently among RLS sufferers and there was a tendency toward reported social isolation related to RLS. Subjects with RLS more frequently reported depressed mood (OR, 2.6; 95% CI, 1.8–3.8), and complained more often of reduced libido (OR, 2.2; 95% CI, 1.4–3.3). RLS sufferers more frequently reported hypertension (OR, 1.5; 95% CI, 0.9–2.4) and heart problems (OR, 2.5; 95% CI, 1.4–4.3). Results show that restless legs syndrome is common among men. It is hypothesized that RLS may be associated with several somatic and neuropsychiatric symptoms.


European Neurology | 2001

Restless Legs Syndrome among Working-Aged Women

Jan Ulfberg; Birgitta Nyström; Ned Carter; Christer Edling

A random sample of 200 women, aged 18–64 years, living in a county in mid-Sweden, was sent a questionnaire that included questions about sleep habits, symptoms of sleepiness and neuropsychiatric complaints. Standardized diagnostic criteria determined by the International Restless Legs Syndrome Study Group were used to investigate the prevalence of restless legs syndrome (RLS). Possible associations between RLS and neuropsychiatric complaints were also investigated. Odds ratios for different variables were calculated by means of multivariate logistic regression. 11.4% of the women suffered from RLS. Sleep-related complaints were more frequent among RLS sufferers than among nonsufferers. Complaints of daytime headache were reported 5 times more frequently among RLS sufferers, and there was a tendency towards social isolation related to RLS. Subjective problems in performing work due to sleepiness were ninefold among the women with RLS. These results indicate that RLS together with an association to neuropsychiatric symptoms is common among working-aged women.


Journal of Neurology | 1996

Headache, snoring and sleep apnoea

Jan Ulfberg; Ned Carter; Mats Talbäck; Christer Edling

To evaluate reported headache prevalence among the general population and patients suffering from snoring and obstructive sleep apnoea syndrome (OSAS), a cross-sectional study was performed among those aged 30–64 years residing in Kopparberg county in central Sweden. Consecutive patients referred to the sleep laboratory in the catchment area who fulfilled objective diagnostic criteria (snorers = 448, OSAS = 324) and a random sample of the general population (n = 583) responded to the same questionnaire. Patients were selected following sleep apnoea screening with 100% specificity for both OSAS and snoring. Responders from the general population were divided into snorers or non-snorers on the basis of self-report. To validate the self-report question on snoring in the questionnaire, 50 males and 49 females, randomly selected from the sample of the general population, underwent sleep apnoea screening in their homes. Headache among both men and women was found to be more prevalent among heavy snorers and OSAS patients compared with the control group. Morning headache, in particular, was at least three times more common among male and female heavy snorers and OSAS patients then among the general population. Headache in the control group was more common among snorers than non-snorers. Among responders, 5% of the general population reported experiencing headache often or very often upon awakening. For the heavy snoring and OSAS groups, 18% reported experiencing headache often or very often upon awakening. The results indicate that headache is common among heavy snorers and OSAS patients regardless of gender.


Accident Analysis & Prevention | 2003

Sleep debt, sleepiness and accidents among males in the general population and male professional drivers

Ned Carter; Jan Ulfberg; Birgitta Nyström; Christer Edling

Men from the general population and male professional lorry and bus drivers were surveyed with regard to sleep habits and motor vehicle and other types of accidents. A random sample of 4000 men in the general population of Dalarna County in mid-Sweden were mailed a questionnaire and served as referents. A total of 1389 male professional lorry and bus drivers from this county responded to the same questionnaire. A total of 161 of the drivers also underwent a sleep study in their homes. The proportion of total accidents was higher among the professional drivers as compared with the males in the population, P=0.03. Reports on traffic accidents were the same in both groups, but the professional drivers reported more accidents at leisure compared with referents, P<0.0001. Accidents of any kind, traffic accidents included, among those affected by both snoring and apneas, were not reported more in either of the groups. At the sleep study, 17% of those examined received the diagnosis of obstructive sleep-apnea syndrome (OSAS). The professional drivers reported proportionally more sleep debt than the referents, P<0.001. Among referents, traffic accidents at leisure, traffic accidents while commuting and accidents at work increased in proportion to sleep debt (P<0.001, 0.006 and 0.002, respectively). The finding that self-perceived sleep debt may have an adverse effect on males in the general population and male professional drivers concerning accident likelihood should have an impact on prevention. These results stress the need to educate the general population on the importance of complying with our biological need of sleep.


Neuroepidemiology | 1997

Occupational Exposure to Organic Solvents and Sleep-Disordered Breathing

Jan Ulfberg; Ned Carter; Mats Talbäck; Christer Edling

STUDY OBJECTIVE To investigate whether people with occupational exposure to organic solvents have a higher prevalence of obstructive sleep apnea syndrome (OSAS) than the general population and to examine the relationship between snoring and exposure to organic solvents. DESIGN AND PARTICIPANTS Consecutive patients, aged 30-64 years, referred during a 3-year period to the sleep laboratory at Avesta Hospital, Sweden, because of suspected OSAS made up the patient groups. Following admission, patients underwent a simplified sleep apnea investigation and were divided into two groups, OSAS (n = 320) and snorers (n = 443). A random sample of 296 men and 289 women aged 30-64 years obtained from a register of all country residents maintained by the county tax authority served as referents (controls). Both patients and referents responded to two questionnaires, including questions about occupation, exposure to organic solvents, and other chemical and physical agents. RESULTS Men with OSAS or snoring and women with snoring had more often been occupationally exposed to organic solvents than the referents, showing an almost twofold increase in risk for those exposed during whole workdays. For men, the risk of OSAS or snoring increased with increasing exposure. CONCLUSION The result indicates that occupational exposure to organic solvents might cause sleep apnea. A new observation is that even snoring could be caused by exposure to organic solvents. It is important to elucidate whether exposure to organic solvents is a cause of OSAS, because such a finding may have important implications for prevention and treatment of sleep disturbances.


Health Physics | 1999

Validation of a geologically based radon risk map: are the indoor radon concentrations higher in high-risk areas?

Lennart Friis; Ned Carter; Olof Nordman; Abraham Simeonidis; Stefan Jardo

Since geographically coded information is frequently used in studies of the relationships between environmental factors and illness at the population level and by authorities for promotion of mitigation, knowledge about the validity of proxy measures is essential. This study was an evaluation of a geologically based map describing the risk for high radon levels, which was used by the municipal authorities to determine the necessity of remedial actions. Annual mean radon gas concentrations for a random sample of one-family homes selected from high-risk areas (n = 252) were compared with those of a random sample of homes from normal and low-risk areas (n = 259). No difference in geometric mean radon concentration was found between the areas, 101 Bq m(-3) and 103 Bq m(-3), respectively. The proportion of homes in each area with radon gas concentrations above the current Swedish administrative limit value for mitigation (400 Bq m(-3)) was similar, approximately 10%. We conclude that the radon risk map was unsuitable for identifying areas of concern. The findings also indicate that geologically based and geographically coded information as a proxy for human exposures can be safely used for scientific and administrative purposes only following validation.


Chest | 1996

Excessive daytime sleepiness at work and subjective work performance in the general population and among heavy snorers and patients with obstructive sleep apnea.

Jan Ulfberg; Ned Carter; Mats Talbäck; Christer Edling


Scandinavian Journal of Work, Environment & Health | 2000

Sleep-disordered breathing and occupational accidents.

Jan Ulfberg; Ned Carter; Christer Edling


Health Care for Women International | 2000

Adverse health effects among women living with heavy snorers

Jan Ulfberg; Ned Carter; Mats Talbäck; Christer Edling


J Movement Disorders | 2001

Prevalence of Restless Legs Syndrome among men aged 18-64 years. An association with somatic disease and neuropsychiatric symptoms.

Jan Ulfberg; Birgitta Nyström; Ned Carter; Christer Edling

Collaboration


Dive into the Ned Carter's collaboration.

Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar

Asenath LaRue

University of Wisconsin-Madison

View shared research outputs
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar

Janet M. Bruner

University of Texas MD Anderson Cancer Center

View shared research outputs
Top Co-Authors

Avatar

Mary Ganguli

University of Pittsburgh

View shared research outputs
Top Co-Authors

Avatar

Paul J. Eslinger

Pennsylvania State University

View shared research outputs
Researchain Logo
Decentralizing Knowledge