Per Nafstad
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Prevalence of Isotretinoin Therapy in Adolescents and Young Adults With and Without Atopic Dermatitis: A Nationwide Prescription-based Population Study Open
Although isotretinoin has anti-inflammatory and immunomodulatory properties, it can exacerbate atopic dermatitis. National estimates of the extent to which patients with atopic dermatitis are affected by severe acne and isotretinoin tolera…
Ten‐year trends of national healthcare costs of asthma, allergic rhinitis, and atopic eczema in 3 million Norwegians Open
Asthma and allergies pose a significant health and economic burden on many populations.1-3 Norway has lacked national figures and relied on estimates from other Nordic countries4, 5 although there are differences in morbidity, health care,…
Childhood central nervous system tumors and leukemia: Incidence and familial risk. A comparative population‐based study in Utah and Norway Open
Background In this study, we aimed to evaluate incidence rates and family risk of the most common childhood cancers, tumors in the central nervous system (CNS), and leukemia among individuals from Norway and individuals with Scandinavian a…
A population‐based study of testicular cancer risk among children and young adults from Norway and Utah, USA Open
Similar family‐based cancer and genealogy data from Norway and Utah allowed comparisons of the incidence of testicular cancer (TC), and exploration of the role of Scandinavian ancestry and family history of TC in TC risk. Our study utilize…
Is the Disease Burden from COPD in Norway Falling off? A Study of Time Trends in Three Different Data Sources Open
COPD morbidity decreased between 2001 and 2017, which might partly be due to less smoking. The drop in smoking prevalence gives promise of a further substantial decrease in the coming decades.
Is the Association of Early Day Care Attendance with Childhood Asthma Explained by Underlying Susceptibility? Open
Background: Previous studies of early day care attendance and asthma development are inconsistent, which may be explained by inadequate control of confounding and effect modification. We examined the effect of early day care on the risk of…
Low levels of antibodies for the oral bacterium Tannerella forsythia predict cardiovascular disease mortality in men with myocardial infarction: A prospective cohort study Open
Antibody levels to periodontal pathogens in prediction of cardiovascular disease (CVD) mortality were explored using data from a health survey in Oslo in 2000 (Oslo II-study) with 12 1/2 years follow-up. IgG antibodies to four common perio…
Is the Disease Burden from COPD in Norway Falling off? A Study of Time Trends in Three Different Data Sources Open
Background: Less smoking should lead to fewer COPD cases. We aimed at estimating time trends in the prevalence and burden of COPD in Norway from 2001 to 2017.\nMethods: We used pre-bronchodilator spirometry and other health data from perso…
Oral health and cardiovascular disease risk factors and mortality of cerebral haemorrhage, cerebral infarction and unspecified stroke in elderly men: A prospective cohort study Open
Background: Stroke mortality comprises different specific diagnoses as cerebral infarction, different haemorrhagic conditions and unspecified stroke. This study seeks to explore the prediction of oral health indicators versus known cardiov…
Agreement between self‐reported and registry‐based use of sleep medications and tranquilizers Open
Purpose The purpose of the present study was to assess the agreement between self‐reported use of sleep medications and tranquilizers and dispensed hypnotics and anxiolytics. Methods Self‐reported medication use was obtained from the popul…
Maternal history of miscarriages and measures of fertility in relation to childhood asthma Open
Background It remains unclear what underlies the greater risk of asthma reported among children conceived by assisted reproductive technologies (ART). Objective Our aim was to clarify the role of parental subfertility and unmeasured confou…
Incidence Trends of Atopic Dermatitis in Infancy and Early Childhood in a Nationwide Prescription Registry Study in Norway Open
Importance With increasing prevalence of atopic dermatitis (AD) and its manifestation in most countries, together with the supporting evidence of the progression to other atopic phenotypes, AD has developed into a worldwide public health c…
Pregnancy exposure to air pollution and early childhood respiratory health in the Norwegian Mother and Child Cohort Study (MoBa) Open
Objectives It is unclear whether maternal air pollution exposure during pregnancy induces changes in the developing respiratory system of a child and whether it has consequences for respiratory health in early childhood. We investigated as…
Association of Maternal Psychosocial Stress With Increased Risk of Asthma Development in Offspring Open
Prenatal maternal psychosocial stress might influence the development of childhood asthma. Evaluating paternal psychosocial stress and conducting a sibling comparison could provide further insight into the role of unmeasured confounding. W…
Acute mountain sickness, arterial oxygen saturation and heart rate among Tibetan students who reascend to Lhasa after 7 years at low altitude: a prospective cohort study Open
Objectives The aim of the present study was to estimate the incidence of acute mountain sickness (AMS) and address the changes in arterial oxygen saturation (SaO 2 ) and heart rate (HR) in native Tibetans who reascend to the high-altitude …
Response to letter to the editor regarding “Acute mountain sickness among tourists visiting the high-altitude city of Lhasa, Tibet, China at 3658 m above sea level: a cross-sectional study” Open
We kindly thank the journal for the opportunity to respond to the recent comments made regarding our manuscript entitled "Acute mountain sickness among tourists visiting the high-altitude city of Lhasa, Tibet, China at 3658 m above sea lev…
A Population-Based Study on Nighttime Road Traffic Noise and Insomnia Open
In an adult population from Oslo, traffic noise was associated with difficulties falling asleep and waking up too early. These findings indicate that sleep quantity may be compromised for individuals living in areas highly exposed to night…
The Influence of Meteorological Factors and Atmospheric Pollutants on the Risk of Preterm Birth Open
Atmospheric pollutants and meteorological conditions are suspected to be causes of preterm birth. We aimed to characterize their possible association with the risk of preterm birth (defined as birth occurring before 37 completed gestationa…
Pre-eclampsia and childhood asthma Open
Studies of pre-eclampsia and childhood asthma are conflicting, and none have performed a formal mediation analysis of preterm birth. We examined the association between pre-eclampsia and asthma at 7 years using national registries, includi…
Maternal Folate Intake during Pregnancy and Childhood Asthma in a Population-based Cohort Open
In this large prospective population-based cohort with essentially complete follow-up, pregnant women taking supplemental folic acid at or above the recommended dose, combined with a diet rich in folate, reach a total folate intake level a…