| 1. |
- Hökby, Sebastian, et al.
(författare)
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Are Mental Health Effects of Internet Use Attributable to the Web-Based Content or Perceived Consequences of Usage? A Longitudinal Study of European Adolescents
- 2016
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Ingår i: JMIR Mental Health. - : JMIR Publications Inc.. - 2368-7959. ; 3:3
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Tidskriftsartikel (refereegranskat)abstract
- Background: Adolescents and young adults are among the most frequent Internet users, and accumulating evidence suggests that their Internet behaviors might affect their mental health. Internet use may impact mental health because certain Web-based content could be distressing. It is also possible that excessive use, regardless of content, produces negative consequences, such as neglect of protective offline activities.Objective: The objective of this study was to assess how mental health is associated with (1) the time spent on the Internet, (2) the time spent on different Web-based activities (social media use, gaming, gambling, pornography use, school work, newsreading, and targeted information searches), and (3) the perceived consequences of engaging in those activities.Methods: A random sample of 2286 adolescents was recruited from state schools in Estonia, Hungary, Italy, Lithuania, Spain, Sweden, and the United Kingdom. Questionnaire data comprising Internet behaviors and mental health variables were collected and analyzed cross-sectionally and were followed up after 4 months.Results: Cross-sectionally, both the time spent on the Internet and the relative time spent on various activities predicted mental health (P <. 001), explaining 1.4% and 2.8% variance, respectively. However, the consequences of engaging in those activities were more important predictors, explaining 11.1% variance. Only Web-based gaming, gambling, and targeted searches had mental health effects that were not fully accounted for by perceived consequences. The longitudinal analyses showed that sleep loss due to Internet use (beta =. 12, 95% CI=0.05-0.19, P =. 001) and withdrawal (negative mood) when Internet could not be accessed (beta =. 09, 95% CI=0.03-0.16, P <. 01) were the only consequences that had a direct effect on mental health in the long term. Perceived positive consequences of Internet use did not seem to be associated with mental health at all.Conclusions: The magnitude of Internet use is negatively associated with mental health in general, but specific Web-based activities differ in how consistently, how much, and in what direction they affect mental health. Consequences of Internet use (especially sleep loss and withdrawal when Internet cannot be accessed) seem to predict mental health outcomes to a greater extent than the specific activities themselves. Interventions aimed at reducing the negative mental health effects of Internet use could target its negative consequences instead of the Internet use itself.
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| 2. |
- Anthonsen, Mette, 1972, et al.
(författare)
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Effects of rent dependency on quality of government
- 2012
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Ingår i: Economics of Governance. - : Springer Science and Business Media LLC. - 1435-6104 .- 1435-8131. ; 13:2, s. 145-168
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Tidskriftsartikel (refereegranskat)abstract
- This paper introduces quality of government rather than regime type as dependent variable in studies of political effects of natural resources. It consists of two parts. First, it argues for an effect of fiscal dependency of oil and gas rents on quality of government. Second, it finds significant, negative effects of oil and gas rent dependency on three empirical indicators of quality of government-low corruption, bureaucratic quality and legal impartiality-in a sample of 139 states in the period 1984-2006. The results hold for inclusion of control variables such as regime type, income, region and religion.
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| 3. |
- Aylar, Emre, et al.
(författare)
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Lag truncation and the local asymptotic distribution of the ADF test for a unit root
- 2019
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Ingår i: Statistical Papers. - : Springer Science and Business Media LLC. - 0932-5026 .- 1613-9798. ; 60:6, s. 2109-2118
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Tidskriftsartikel (refereegranskat)abstract
- The issue of lag selection in ADF unit root testing is important, even asymptotically, for if the number of lags is not allowed to increase at a certain rate the test might not be correctly sized. However, size control is not the only concern. Indeed, simulations have repeatedly shown how increasing lag lengths tend to be associated with reductions in power, thus adding to the well-known low power problem when the alternative is local to the unit root. But while the simulation evidence is plentiful, there is as of yet almost no asymptotic results that can be used to ascertain whether lag length has any effect on the local asymptotic power of the ADF test. The purpose of the present paper is to fill this gap in the literature.
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| 4. |
- Barnevik Olsson, Martina, et al.
(författare)
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Autism before diagnosis : crying, feeding and sleeping problems in the first two years of life
- 2013
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Ingår i: Acta Paediatrica. - : Wiley. - 0803-5253 .- 1651-2227. ; 102:6, s. 635-639
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Tidskriftsartikel (refereegranskat)abstract
- Aim To chart early registered regulatory problems (RP) in a representative group of young children with and without autism spectrum disorder (ASD). Methods The target group comprised 208 preschool children with ASD, whose records from the Child Health Centres (CHC) were reviewed regarding numbers of consultations for excessive crying, feeding and sleeping problems. The records from an age- and gender-matched comparison group were obtained from the same CHCs as those of the index children Results Significant differences between the ASD and comparison groups were found for each domain studied and when domains were collapsed. Two or more consultations had occurred in 44% of the children in the ASD group and in 16% of the comparison group (p<0.001). No correlations were found with regard to gender, later severity of autism, cognitive level or degree of hyperactivity. Conclusion Regulatory problems (RP) were much more common in children who later received a diagnosis of ASD. Children with many RP in infancy require attention from CHC and paediatric services and need to be followed with regard to development and family support.
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| 5. |
- Barnevik Olsson, Martina, et al.
(författare)
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Children with borderline intellectual functioning and autism spectrum disorder : developmental trajectories from 4 to 11 years of age
- 2017
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Ingår i: Neuropsychiatric Disease and Treatment. - 1176-6328 .- 1178-2021. ; 13, s. 2519-2526
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Tidskriftsartikel (refereegranskat)abstract
- Background: Studies on autism have tended to focus either on those with intellectual disability (ie, those with intellectual quotient [IQ] under 70) or on the group that is referred to as high-functioning, that is, those with borderline, average or above average IQ. The literature on cognition and daily functioning in autism spectrum disorder combined specifically with borderline intellectual functioning (IQ 70-84) is limited. Methods: From a representative group of 208 preschool children diagnosed with autism spectrum disorder, those 50 children in the group with borderline intellectual functioning at ages 4.5-6.5 years were targeted for follow-up at a median age of 10 years. A new cognitive test was carried out in 30 children. Parents were interviewed with a semi-structured interview together with the Vineland Adaptive Behavior Scales (n=41) and the Autism-Tics, attention-deficit/hyperactivity disorder (AD/HD) and other comorbidities inventory (A-TAC) (n=36). Results: Most children of interviewed parents presented problems within several developmental areas. According to A-TAC and the clinical interview, there were high rates of attention deficits and difficulties with regulating activity level and impulsivity. Vineland Adaptive Behavior Scales composite scores showed that at school age, a majority of the children had declined since the previous assessment at ages between 4.5 and 6.5 years. Almost half the tested group had shifted in their IQ level, to below 70 or above 84. Conclusion: None of the children assessed was without developmental/neuropsychiatric problems at school-age follow-up. The results support the need for comprehensive follow-up of educational, medical and developmental/neuropsychiatric needs, including a retesting of cognitive functions. There is also a need for continuing parent/family follow-up and support.
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| 6. |
- Barnevik Olsson, Martina, et al.
(författare)
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Children with borderline intellectual functioning and autism spectrum disorder: developmental trajectories from 4 to 11 years of age
- 2017
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Ingår i: Neuropsychiatric Disease and Treatment. - : Informa UK Limited. - 1178-2021. ; 13, s. 2519-2526
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Tidskriftsartikel (refereegranskat)abstract
- Background: Studies on autism have tended to focus either on those with intellectual disability (ie, those with intellectual quotient [IQ] under 70) or on the group that is referred to as "high-functioning", that is, those with borderline, average or above average IQ. The literature on cognition and daily functioning in autism spectrum disorder combined specifically with borderline intellectual functioning (IQ 70-84) is limited. Methods: From a representative group of 208 preschool children diagnosed with autism spectrum disorder, those 50 children in the group with borderline intellectual functioning at ages 4.5-6.5 years were targeted for follow-up at a median age of 10 years. A new cognitive test was carried out in 30 children. Parents were interviewed with a semi-structured interview together with the Vineland Adaptive Behavior Scales (n=41) and the Autism-Tics, attention-deficit/hyperactivity disorder (AD/HD) and other comorbidities inventory (A-TAC) (n=36). Results: Most children of interviewed parents presented problems within several developmental areas. According to A-TAC and the clinical interview, there were high rates of attention deficits and difficulties with regulating activity level and impulsivity. Vineland Adaptive Behavior Scales composite scores showed that at school age, a majority of the children had declined since the previous assessment at ages between 4.5 and 6.5 years. Almost half the tested group had shifted in their IQ level, to below 70 or above 84. Conclusion: None of the children assessed was without developmental/neuropsychiatric problems at school-age follow-up. The results support the need for comprehensive follow-up of educational, medical and developmental/neuropsychiatric needs, including a retesting of cognitive functions. There is also a need for continuing parent/family follow-up and support.
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| 7. |
- Barnevik Olsson, Martina, et al.
(författare)
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Preschool to School in Autism : Neuropsychiatric Problems 8 Years After Diagnosis at 3 Years of Age
- 2016
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Ingår i: Journal of autism and developmental disorders. - : Springer Science and Business Media LLC. - 0162-3257 .- 1573-3432. ; 46:8, s. 2749-2755
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Tidskriftsartikel (refereegranskat)abstract
- The study presents neuropsychiatric profiles of children aged 11 with autism spectrum disorder, assessed before 4.5 years, and after interventions. The original group comprised a community sample of 208 children with ASD. Parents of 128 participated-34 with average intellectual function, 36 with borderline intellectual function and 58 with intellectual disability. They were interviewed using the Autism-Tics, AD/HD and other Comorbidities interview. Criteria for a clinical/subclinical proxy of ASD were met by 71, 89 and 95 %, respectively. Criteria for at least one of ASD, AD/HD, Learning disorder or Developmental Coordination Disorder were met by 82, 94 and 97 %. More than 90 % of children with a preschool diagnosis of ASD have remaining neuropsychiatric problems at 11, despite early intervention.
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| 8. |
- Barnevik Olsson, Martina, et al.
(författare)
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Recovery from the diagnosis of autism - and then?
- 2015
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Ingår i: Neuropsychiatric Disease and Treatment. - 1176-6328 .- 1178-2021. ; 11, s. 999-1005
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Tidskriftsartikel (refereegranskat)abstract
- Background: The aim of this study was to follow up the 17 children, from a total group of 208 children with autism spectrum disorder (ASD), who recovered from autism. They had been clinically diagnosed with ASD at or under the age of 4 years. For 2 years thereafter they received intervention based on applied behavior analysis. These 17 children were all of average or borderline intellectual functioning. On the 2-year follow-up assessment, they no longer met criteria for ASD. Methods: At about 10 years of age they were targeted for a new follow-up. Parents were given a semistructured interview regarding the child's daily functioning, school situation, and need of support, and were interviewed using the Vineland Adaptive Behavior Scales (VABS) and the Autism - Tics, Attention-deficit/hyperactivity disorder (AD/HD), and other Comorbidities (A-TAC) telephone interview. Results: The vast majority of the children had moderate-to-severe problems with attention/activity regulation, speech and language, behavior, and/or social interaction. A majority of the children had declined in their VABS scores. Most of the 14 children whose parents were A-TAC-interviewed had problems within many behavioral A-TAC domains, and four (29%) had symptom levels corresponding to a clinical diagnosis of ASD, AD/HD, or both. Another seven children (50%) had pronounced subthreshold indicators of ASD, AD/HD, or both. Conclusion: Children diagnosed at 2-4 years of age as suffering from ASD and who, after appropriate intervention for 2 years, no longer met diagnostic criteria for the disorder, clearly needed to be followed up longer. About 3-4 years later, they still had major problems diagnosable under the umbrella term of ESSENCE (Early Symptomatic Syndromes Eliciting Neurodevelopmental Clinical Examinations). They continued to be in need of support, educationally, from a neurodevelopmental and a medical point of view. According to parent interview data, a substantial minority of these children again met diagnostic criteria for ASD.
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| 9. |
- Basher, Syed A., et al.
(författare)
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Is there Really a Unit Root in the Inflation Rate? More Evidence from Panel Data Models
- 2008
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Ingår i: Applied Economics Letters. - : Informa UK Limited. - 1466-4291 .- 1350-4851. ; 15:3, s. 161-164
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Tidskriftsartikel (refereegranskat)abstract
- Time series unit root evidence suggests that inflation is nonstationary. By contrast, when using more powerful panel unit root tests, Culver and Papell (1997) find that inflation is stationary. In this article, we test the robustness of this result by applying a battery of recent panel unit root tests. The results suggest that the stationarity of inflation holds even after controlling for cross-sectional dependence and structural change.
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| 10. |
- Basher, Syed A., et al.
(författare)
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Panel cointegration and the monetary exchange rate model
- 2009
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Ingår i: Economic Modelling. - : Elsevier BV. - 0264-9993. ; 26:2, s. 506-513
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Tidskriftsartikel (refereegranskat)abstract
- This paper re-examines the validity of the monetary exchange rate model during the post-Bretton Woods era for 18 OECD countries. Our analysis simultaneously considers the presence of both cross-sectional dependence and multiple structural breaks, which have not received much attention in previous studies of the monetary model. The empirical results indicate that the monetary model emerges only when the presence of structural breaks and cross-country dependence has been taken into account. Evidence is also provided suggesting that the breaks in the monetary model can be derived from the underlying purchasing power parity relation. (C) 2008 Elsevier B.V. All rights reserved.
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