Kristian Sommerfelt's research while affiliated with Haukeland University Hospital and other places

Publications (53)

Article
Objective: To investigate development and predictors of mental health problems from five to eleven years of age in children born extremely preterm (EP). Method: In a national Norwegian cohort of children born before a gestational age of 28 weeks or with a birthweight <1000 g mental health was assessed by parents at five and eleven years of age u...
Article
Full-text available
The aims were to investigate mental health problems with the Strength and Difficulties Questionnaire (SDQ) in children born extremely preterm/extremely low birth weight (EP/ELBW) without severe disabilities compared to controls, and to identify peri-, or neonatal factors possibly predicting later mental health problems. A national Norwegian cohort...
Article
Full-text available
Objective: To describe the prevalence and gender characteristics of mental health problems in extremely preterm/extremely low birth weight (EP/ELBW) children without intellectual disabilities, blindness, deafness, or severe cerebral palsy compared with a reference group at 11 years of age. Methods: In a national cohort of EP/ELBW children, menta...
Article
Objective To describe the prevalence of mental health problems, and symptoms of Autism Spectrum Disorders (ASD), Attention Deficit/Hyperactivity Disorder (ADHD), Anxiety and Obsessive Compulsive Disorder (OCD) at 11 years of age in extremely preterm/extreme low birth weight (EP/ELBW) children without mental retardation, blindness, deafness, or seve...
Article
AimFetoplacental Doppler abnormalities have been associated with increased neonatal mortality and morbidity. This study evaluated the associations between prenatal Doppler assessments and neonatal mortality and morbidity in premature infants born small for gestational age or after pre-eclampsia.Methods This was a population-based study of infants b...
Article
Full-text available
ADHD is more common in children born preterm than at term. The purpose of the study was to examine if, and to what extent, ADHD symptoms are associated with minor neurodevelopmental impairments (NDI) in extremely preterm children. In a national population-based cohort with gestational age 22-27 weeks or birth weight <1,000 g assessed at 5 years of...
Article
Aim: To investigate whether absent or reversed end-diastolic flow in the umbilical artery (AREDF) is associated with neonatal mortality, morbidity or long-term neurocognitive outcome in extremely preterm infants exposed to preeclampsia or intrauterine growth restriction. Methods: Prenatal Doppler data were retrospectively collected for liveborn...
Article
To examine the predictive value of early assessments on developmental outcome at 5 years in children born extremely preterm. This is a prospective observational study of all infants born in Norway in 1999-2000 with gestational age (GA) <28 weeks or birth weight (BW) <1000 g. At 2 years of age, paediatricians assessed mental and motor development fr...
Article
To examine the prevalence of neurodevelopmental disability and the predictive value of pre-, peri-, and postnatal data on neurologic, sensory, cognitive, and motor function in children born extremely preterm. This was a prospective observational study of all infants born in Norway between 1999 and 2000 with gestational ages between 22 and 27 weeks...
Article
Extreme prematurity carries a high risk of neurosensory disability. Examine which information obtained pre-, peri- and postnatally may be predictive of neurosensory disabilities at 2 years of age. Prospective observational study of all infants born in Norway in 1999 and 2000 with gestational age (GA) 22-27 completed weeks or birth weight (BW) of 50...
Article
To compare trajectories for growth and somatic health characteristics until adulthood of non-handicapped low birthweight (LBW) and normal birthweight (NBW) children. Population-based longitudinal follow-up study. LBW (<2 kg) and NBW (>3 kg) children were followed at 5, 11 and 19 years of age. At 19 years 134 of 173 subjects with LBW (77%), and 135...
Article
To assess if growth restricted (small for gestational age, SGA) extremely preterm infants have excess neonatal mortality and morbidity. This was a cohort study of all infants born alive at 22-27 weeks' post menstrual age in Norway during 1999-2000. Outcomes were compared between those who were SGA, defined as a birth weight less than the fifth perc...
Article
The combined burden of psychosocial (Achenbach scales), cognitive (Raven matrices), and executive function (EF) problems was studied in a population-based sample of 6- to 12-year-old children with epilepsy (n=162; 99 males, 63 females) and in an age- and sex-matched control group (n=107; 62 males, 45 females). Approximately 35% of the children with...
Article
We describe two Norwegian children with fascioscapulohumeral muscular dystrophy in whom Coats' disease, deafness, mental retardation and possible epilepsy were the presenting features. The children have a 4q35 deletion giving a small residual repeat fragment that they have inherited from their father who is a mosaic. Fundal changes consistent with...
Article
Full-text available
The aims of the study were to explore hyperactivity-inattention (HI) symptoms and co-existing symptoms of emotional and behavioural problems among African school children and their relationship with health status, socio-demographic factors, and school performance. A case-control approach was used. The Strengths and Difficulties Questionnaire (SDQ)...
Article
Executive functions (EFs), seizure-related factors, and school performance were studied in a population-based sample of children with epilepsy (n=117; 71 males, 46 females; mean age 10y 5mo [SD 2y]; range 6y-12y 11mo) and a comparison group (n=124; 71 males, 53 females; mean age 10y 1mo [SD 2y 1mo]; range 6y-12y 11mo). EF, cognitive function, depre...
Article
In this study we describe psychosocial functions and seizure-related factors in a population-based sample of children with epilepsy. Psychosocial problems (Achenbach scales), cognitive function, and socioeconomic status were studied in 117 children with epilepsy aged between 6 and 13 years (mean age 11y [SD 2y 1mo] and 10y 8mo [SD 2y]; 71 males, 46...
Article
To examine whether chorioamnionitis (CA) is associated with long-term cognitive impairment in low-birthweight (LBW) children without major handicaps such as cerebral palsy. Population-based long-term follow-up study at 11 y of age of 130 LBW children with birthweight less than 2,000 g, without major handicaps. Thirteen children with maternal signs...
Article
Full-text available
The aims of the study were: (1) to describe the performance of African children with symptoms of attention-deficit hyperactivity disorder on selected neuropsychologic tests and compare it with performance among peers of the same age without symptoms; (2) to explore through a factor analysis if the selected tests cover the same functions as known fr...
Article
Shunt failure is by far the most frequent problem in children with shunts, and most of them will experience this condition at some point in their lives. In order to identify causes of shunt failure, and to compare multi-component and one-piece shunt systems, we analyzed retrospectively all pediatric shunt procedures in our Department during an 11-y...
Article
Full-text available
To estimate the prevalence and determinants of attention deficit and hyperactivity disorder (ADHD) symptoms among school children in Kinshasa, an African urban setting. The 18-items of the Disruptive Behaviour Disorder rating scale (DBD), which is based on the Diagnostic and Statistical Manual for mental disorders 4(th) edition (DSM-IV), were used...
Article
To describe and compare physical growth, current health status, functional limitations and neurodevelopmental impairments (defined as low IQ, school problems or psychiatric disorder) at 11 y of age in a population of non-handicapped low-birthweight (LBW) children with that of normal-birthweight (NBW) children. A population-based sample of 130 LBW c...
Article
Full-text available
In Africa, little is known about child mental health. This study piloted the Strengths and Difficulties Questionnaire (SDQ) in Kinshasa, investigated mental health problems and the association between these problems and school performance, demographic factors, illness and nutrition. An epidemiological survey was conducted with 1,187 children, 7-9 y...
Article
To study the relationship between seizure-related factors, non-verbal intelligence, and socio-economic status (SES) in a population-based sample of children with epilepsy. The latest ILAE International classifications of epileptic seizures and syndromes were used to classify seizure types and epileptic syndromes in all 6-12 year old children (N=198...
Article
Based on results from a national survey we discuss the status and prospects of Norwegian child neurology and habilitation. A questionnaire on neurology and habilitation was sent to all 22 Norwegian departments of paediatrics. All departments responded. The organisation of services varied considerably. Only one department registered children admitte...
Article
The objective of this study was to explore the nature of impaired attention in low birth weight children. A population-based sample (n = 129) of 11-year-old low birth weight children was compared with a randomized group of normal birth weight children (n = 128). Continuous Performance Test, a Cue-Target Task, and a Stroop Color-Word test were used...
Article
The objective of this study was to evaluate cognitive functions, changes over time, and prenatal, perinatal, and neonatal predictors in low birth weight children. A cohort of 130 low birth weight children was compared with 131 control children. A neuropsychologic test battery including subtests from the Wechsler Intelligence Scale for Children-Revi...
Article
Myelomeningocele is a congenital condition where the central nervous system is affected; it may cause paresis in the bladder, colon and lower extremities. For the patients, faecal incontinence and obstipation are troublesome problems that are difficult to treat successfully. 13 persons were included in the study. Faecal incontinence was the main in...
Article
Full-text available
To evaluate the risk of long term behavioural problems and psychiatric disorders associated with being born with low birth weight. DESIGN/STUDY GROUPS: A population based, controlled follow up study at 11 years of age of 130 low birthweight (LBW) children weighing less than 2000 g at birth who were without major handicaps, and a random sample of 13...
Article
Aim. To describe and compare school performance and IQ at 11 y of age in a population of 130 children weighing less than 2000 g at birth without any major handicaps (low birthweight) and a random control sample of 131 children born at term weighing over 3000 g (normal birthweight); and to evaluate the relative strength of parental factors versus ch...
Article
The aim of this study was to evaluate neuropsychologic and motor performance in term small-for-gestation preschool children. A patient-based sample of 311 5-year-old children with birth weights less than the fifteenth percentile for gestation was compared with a random sample of 321 appropriate-for-gestation control subjects. The main assessment to...
Article
To describe and compare school performance and IQ at 11 y of age in a population of 130 children weighing less than 2000 g at birth without any major handicaps (low birthweight) and a random control sample of 131 children born at term weighing over 3000 g (normal birthweight); and to evaluate the relative strength of parental factors versus child b...
Article
The association between child cognitive abilities and maternal ratings of child externalizing behaviors was investigated in a randomly selected sample of 290 preschool children. Child cognitive abilities were assessed by the WPPSI-R, whereas mothers completed the Yale Children's Inventory for the assessment of child externalizing behaviors. Materna...
Article
The aim of this study was to evaluate the effect of therapeutic electrical stimulation (TES) applied to antagonists of spastic leg muscles on gross motor function in children with spastic diplegic cerebral palsy. Twelve children between 5 and 12 years of age completed a 24-month crossover study in which six were randomly assigned to receive TES for...
Article
Unlabelled: The aim was to assess motor function during infancy in order to predict later function, mainly cerebral palsy. The neuromotor development of a population-based cohort of 209 of 236 (89%) survivors with a birthweight less than 2000 g was assessed using the Infant Neurological International Battery (INFANIB) and detailed neurological ass...
Article
Full-text available
To assess the relative significance for cognitive development of small for gestational age, parental demographic factors, and factors related to the child rearing environment. IQ of a population based cohort of 338 term infants who were small for gestational age (SGA) and without major handicap, and a random control sample of 335 appropriate for ge...
Article
Norwegian populated-based normative data on the Yale Children's Inventory (YCI) were provided for boys. All parents of boys aged 8 through 11 years in the county of Hammerfest received the YCI, and 77% responded. Mean scores on the YCI scales attention, activity, tractability, and fine motor were significantly lower in the Norwegian sample compared...
Article
Full-text available
Gender-related differences in the prediction of five year-olds' cognitive abilities from measures of distal environment, proximal environment and infant test scores were examined in a random sample of 93 boys and 90 girls. Distal environmental data included maternal IQ, maternal and paternal education. Proximal environmental data included two varia...
Article
Investigated long-term effects of infant temperament on problem behavior and cognitive abilities at age 5 years, taking into account interactions between infant temperament and biological and social risk. Found that when high scores on temperamental factors are combined with social or biological risk, the level of later behavioral problems is incre...
Article
The aim was to evaluate neuropsychological performance and its pre-, and perinatal predictors in low birth weight (LBW) preschool children. A population-based sample of 137 5-year-old children with birth weights less than 2000 g and without major handicaps was compared with a random sample of 152 normal birth weight term controls. Main assessment t...
Article
The frequency of cerebral palsy increases with decreasing gestational age affecting approximately 7% of survivors with birth weights less than 1500 g (very low birth weight, VLBW) [7]. In addition, low birth weight (birth weight less than 2500 g, LBW) and VLBW children without cerebral palsy or other major neurohandicaps have an increased frequency...
Article
The aim of the present study was to evaluate the long-term prognostic significance of transient increase in muscle tone during infancy (dystonia) in very low-birthweight (VLBW) infants without cerebral palsy. Motor (Peabody Developmental Motor Scales), cognitive (Wechsler Preschool and Primary scale of Intelligence) and behavioural (Personality Inv...
Article
Preschool behavior of a population-based sample of 144 5-year-old children with birthweights less than 2000g (LBW) was compared with a random sample of 163 normal-birthweight term controls. The Personality Inventory for Children and the Yale Children's Inventory were completed by the mothers, and child behavior during psychometric testing was asses...
Article
The effects of maternal child-rearing attitudes, as measured by the Child Rearing Practices Report, on 5-yr.-old children's Verbal IQ and Performance IQ were investigated in a Scandinavian sample of 108 boys and 126 girls. The maternal child-rearing attitude of Restrictiveness, as defined by scores on the Report, showed negative relations to the co...
Article
The aims of the study were to investigate: (a) the relationship between low birthweight (LBW) and pre-school neuromotor development; and (b) the predictive value of various pre-, peri-, and neonatal factors for neuromotor development in LBW pre-school children. A population based sample of 144 5-year-old LBW children (birthweight < 2000 g) with no...
Article
Full-text available
A population based cohort of 144 children weighing less than 2000 g who were without major handicap, and a random control sample of 163 children born at term and weighing over 3000 g were investigated. The aim was to assess the relative importance for cognitive development at 5 years of age, of birthweight, parental demographic factors, and factors...
Article
Personality and behavioural characteristics of a population-based cohort of 29 very low-birth-weight (VLBW) infants were compared with those of 29 matched, term controls at eight years of age. The VLBW infants were born to families of lower socioeconomic status (p = 0.04) and had a lower mean IQ (93 versus 104, p = 0.008) and motor abilities (p = 0...
Article
Full-text available
This population based study compares the performance of 8 year old children with birth weight under 1500 g (VLBW) without major handicap (n=29) and random control children (n=29). An extensive battery consisting of neuromotor evaluation, antropometry, WISC-R cognitive test, Halstead-Reitan neuropsychological test battery, Kløve-Matthews Motor Stead...
Article
Four siblings aged 12–18 years with progressive myoclonus epilepsy demonstrated a subclinical stage at the age of 9–11 years, with visual blackouts and polyspike electroencephalographic (EEG) activity on photic stimulation, an early myoclonic stage at the age of 12–15 years, with increasing segmental, stimulus-sensitive myoclonus, occasional noctur...
Article
A previously undescribed form of complicated hereditary spastic paraplegia with epileptic myoclonus in four affected offspring of consanguineous parents is reported. The disorder was inherited as an autosomal recessive trait. Age at onset varied from the prenatal period to 10 years. The main findings when examined between 26 and 42 years of age wer...

Citations

... Behavioral problems are organized on 4 scales (conduct disorder, hyperactivity/inattention, relationship problems with peers and emotional symptoms) and a fifth scale assesses prosocial behavior. Several studies have used the SDQ to investigate the behavioral profile of preterm or low birth weight populations Burnett et al., 2019;Delobel-Ayoub et al., 2009;Fevang et al., 2017;Gardner, 2004;Indredavik et al., 2005;Samara et al., 4.2. Journal Preprint: Behavioral outcome of very preterm children at five years of age: Prognostic utility of brain tissue volumes at TEA and perinatal factors van Houdt et al., 2020), confirming the increased risk for symptoms related to the triad described by Johnson and Marlow ((Johnson and Marlow, 2011)). ...
... Estudos apontam déficits motores, na cognição e na linguagem (Johnson & Marlow, 2014;Laerum et al., 2017;Woodward et al., 2009). Na área psíquica, referem menor autorregulação emocional (Clark, Woodward, Horwood & Moor, 2008;Scott et al., 2012), mais problemas emocionais e comportamentais (Johnson & Marlow, 2014;Linsell et al., 2016;Woodward et al., 2009), maior prevalência de Transtorno de Déficit de Atenção e Hiperatividade (Johnson & Marlow, 2014;Linsell et al., 2016;Fevang, Hysing, Markestad & Sommerfelt, 2016;Laerum et al., 2017;Scott et al., 2012;Sucksdorff et al., 2015) e de Transtorno do Espectro Autista (Johnson & Marlow, 2014;Linsell et al., 2016;Fevang et al., 2016). Prematuros costumam ter mais problemas na saúde mental (Fevang et al., 2016), maiores índices de ansiedade (Laerum et al., 2017;Lieshout, Boyle, Saigal, Morrison & Schmidt, 2015), de transtorno de humor (Laerum et al., 2017), de desordem somatoforme ou ter algum transtorno psiquiátrico (Johnson & Marlow, 2014;Laerum et al., 2017;Lindström, Lindblad & Hjern, 2009;Linsell et al., 2016). ...
... In these specific cases, administration of antibiotics is often not initiated since an intrauterine infection is not suspected. Therefore, merely the fetal Doppler ultrasound abnormalities [21] and not the absence of administration of antibiotics within 24 h after birth may have contributed to the increased association with the development of NEC. ...
... At 11 years of age, information was based on parent-and teacher-reported questionnaires. Characteristics of the cohort, definitions of neonatal characteristics, and overall outcome in terms of mortality and morbidity until 11 years of age have been published [19][20][21][22][23][24][25]. ...
... Among high-risk samples, UA Doppler predicts developmental delay 7-10 and motor development 9-11 at 1-2 years of age, while follow-up studies among 4-9-year-olds reported no association with intelligence quotient (IQ). [12][13][14] Among low-risk pregnancies, high UA-PI was associated with poorer memory functioning among 12-year-olds: differences in general reasoning or academic achievement, albeit in the same direction, were not statistically significant. 15 Evidence from large prospective population-based studies is lacking: while costly, the benefit of these studies is that they are ideally suited for This article is protected by copyright. ...
... A more easygoing temperament was associated with more well-being [40]. Aggressive children are likely to have more challenging temperament characteristics [41][42][43][44] that have the potential to influence the responses of others, setting up mutually reinforcing interpersonal interaction patterns that may maintain problem behavior over the long term [45]. Previous studies have found that infants with a difficult temperament remain irritable and are less likely to fit in with their environment for several years and may exhibit abnormal behavior in childhood [43,[46][47][48], while an easy temperament functions as a protective mechanism for these outcomes in socialemotional development [40,46]. ...
... These results confirm the association of maternal educational level with cognitive skills among children born VPT in a wide range of settings, previously only reported in smaller scale or single country studies. 12,13,[46][47][48] While there were some differences across the cohorts in effect sizes, with modest to high heterogeneity, all but one cohort had negative SMDs for low compared to high maternal education. This cohort, EPICure-1 which included births <27 weeks of GA in the UK and Ireland in 1995, had few children with mothers in the high educational level category (8 to 16 depending on the age group), which may reflect the characteristics of families with extremely preterm children or inadequacy of the classification for describing mothers' education in that time period. ...
... It contributes to 26% of neonatal causes of death in China (2). Despite the increased survival rate with advances in prenatal and neonatal care (3,4), these surviving preterm infants are at an increased risk of hypertension, metabolic syndrome, and impaired neurodevelopment (5)(6)(7). Consequently, a full understanding of optimal postnatal growth is a prerequisite for tailoring adequate supportive treatments to improve short-term and long-term outcomes in preterm infants (8). This requires robust growth charts to monitor whether preterm infants have potentially abnormal growth that might be indicative of adverse health conditions (9). ...
... At 11 years of age, information was based on parent-and teacher-reported questionnaires. Characteristics of the cohort, definitions of neonatal characteristics, and overall outcome in terms of mortality and morbidity until 11 years of age have been published [19][20][21][22][23][24][25]. ...
... Very preterm infants (< 32 weeks gestation) have a relatively high nutrient requirement for growth and development. Poor growth in the postnatal period is associated with later impaired neurodevelopment [1][2][3], metabolic disorders [4] and short stature [5]. Provision of adequate energy and nutrients (e.g. ...