• Is age at menarche associated with total mortality? The Tromsø Study 

      Lundblad, Marie Wasmuth; Jacobsen, Bjarne K. (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-05-01)
      <p><i>Purpose</i>: Early age at menarche (AAM) has been associated with increased mortality and morbidity, including premature death from all causes, breast cancer and cardiovascular diseases. The aim of this study was to examine the association between AAM and all-cause mortality.</p> <p><i>Subjects and methods</i>: A total of 12,409 women aged 25–94 years who took part in the fourth Tromsø Study ...
    • Is the ongoing obesity epidemic partly explained by concurrent decline in cigarette smoking? Insights from a longitudinal population study. The Tromsø Study 1994–2016 

      Løvsletten, Ola; Njølstad, Inger; Wilsgaard, Tom; Hopstock, Laila Arnesdatter; Jacobsen, Bjarne K.; Bønaa, Kaare Harald; Eggen, Anne Elise; Løchen, Maja-Lisa (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-03-23)
      <p>The increase of obesity coincides with a substantial decrease in cigarette smoking. We assessed post-cessation weight change and its contribution to the obesity epidemic in a general population in Norway. A total of 14,453 participants (52.6% women), aged 25–54 years in 1994, who attended at least two of four surveys in the Tromsø Study between 1994 and 2016, were included in the analysis. Hereof ...
    • Leisure time and occupational physical activity, resting heart rate, and mortality in the Arctic region of Norway: The Finnmark Study 

      Hermansen, Rune Hermann; Jacobsen, Bjarne K.; Løchen, Maja-Lisa; Morseth, Bente (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-05-20)
      <p><i>Aims - </i>This study examined the association of leisure time physical activity, occupational physical activity, and resting heart rate with all-cause and cardiovascular disease mortality in Sami and non-Sami populations. <p><i>Study design - </i>This was a longitudinal, observational population-based study. <p><i>Methods - </i>The Finnmark 3 study cohort was examined in 1987–1988 and ...
    • Longitudinal and secular trends in total cholesterol levels and impact of lipid-lowering drug use among Norwegian women and men born in 1905–1977 in the population-based Tromsø Study 1979–2016 

      Hopstock, Laila Arnesdatter; Bønaa, Kaare; Eggen, Anne Elise; Grimsgaard, Sameline; Jacobsen, Bjarne K.; Løchen, Maja-Lisa; Mathiesen, Ellisiv B.; Njølstad, Inger; Wilsgaard, Tom (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-08-21)
      Objectives: <br> Elevated blood cholesterol is a modifiable risk factor for cardiovascular disease. Cholesterol level surveillance is necessary to study population disease burden, consider priorities for prevention and intervention and understand the effect of diet, lifestyle and treatment. Previous studies show a cholesterol decline in recent decades but lack data to follow individuals born ...
    • Longitudinal changes in desired body weight compared to changes in body weight: evidence of adaptation to weight gain? 

      Aars, Nils Abel; Jacobsen, Bjarne K. (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-09-21)
      <b>Background: </b>Overweight individuals desire a lower weight than they actually have. Little is known on the extent to which this discrepancy is reduced over time due to adaptation or resignation. The aim of this study is to describe cross-sectional relationships and longitudinal changes in desired body weight and differences between actual and desired body weight according to gender, age and ...
    • Major postoperative complications are associated with impaired long-term survival after gastro-esophageal and pancreatic cancer surgery: a complete national cohort study 

      Aahlin, Eirik Kjus; Olsen, Frank; Uleberg, Bård; Jacobsen, Bjarne K.; Lassen, Kristoffer (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-05-18)
      Background: Some studies have reported an association between complications and impaired long-term survival after cancer surgery. We aimed to investigate how major complications are associated with overall survival after gastro-esophageal and pancreatic cancer surgery in a complete national cohort. <br> Methods: All esophageal-, gastric- and pancreatic resections performed for cancer in Norway ...
    • Mental distress in subjects who did, or did not, move from rural Sami core areas to cities in Norway: The impact of Sami ethnicity 

      Eriksen, Astrid; Melhus, Marita; Jacobsen, Bjarne K.; Broderstad, Ann Ragnhild (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-07-12)
      The aim of the study was to compare the level of mental distress of Sami and non-Sami residents in rural Sami core areas with that of people who have moved from these areas to cities in Norway. Previous research on mental health among the adult Sami population has mainly been conducted in rural areas, and there is a knowledge gap concerning the mental health of urban Sami. This study has a ...
    • Norske pasienter med tykktarmskreft kommer for seint i gang med tilleggsbehandling 

      Olsen, Frank; Uleberg, Bård; Jacobsen, Bjarne K.; Balteskard, Lise (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-01-12)
      BAKGRUNN - For pasienter med tykktarmskreft som ifølge nasjonale retningslinjer skal ha tilleggsbehandling med kjemoterapi, skal denne igangsettes innen 4 – 6 uker etter det kirurgiske inngrepet. Vi ønsket å undersøke om retningslinjene ble fulgt. Vi ønsket også å undersøke om hvorvidt type kirurgisk behandling (åpen eller laparoskopisk) hadde betydning for tid til oppstart av tilleggsbehandling.< ...
    • Physical activity, resting heart rate, and atrial fibrillation: the Tromsø Study 

      Morseth, Bente; Graff-Iversen, Sidsel; Jacobsen, Bjarne K.; Jørgensen, Lone; Nyrnes, Audhild; Thelle, Dag Steinar; Vestergaard, Peter; Løchen, Maja-Lisa (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-03-10)
      Aims: The objective was to examine the association of physical activity and resting heart rate (RHR) with hospital-diagnosed atrial fibrillation (AF) in a Norwegian cohort. <p> Methods and Results: This prospective study included 20 484 adults (50.3% men) who participated in the third Tromsø Study survey in 1986-1987. At baseline, physical activity was assessed by a validated questionnaire, and ...
    • Replacing red and processed meat with lean or fatty fish and all-cause and cause specific mortality in Norwegian women. the Norwegian Women and Cancer Study (NOWAC): A prospective cohort study 

      Jensen, Torill Miriam Enget; Braaten, Tonje Bjørndal; Jacobsen, Bjarne K.; Ibsen, Daniel B.; Skeie, Guri (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-09-11)
      Nordic Nutrition Recommendations recommend reducing red and processed meat and increasing fish consumption, but the impact of this replacement on mortality is understudied. This study investigated the replacement of red and processed meat with fish in relation to mortality. Of 83 304 women in the Norwegian Women and Cancer Study (NOWAC) study, 9420 died during a median of 21·0 years of follow-up. ...
    • The reproducibility of self-reported age at menarche: The Tromsø Study 

      Lundblad, Marie Wasmuth; Jacobsen, Bjarne K. (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-08-22)
      Background: Previous studies of the reproducibility of self-reported age at menarche have been limited because of small study samples, short follow-up and the limited age span of the women included. Methods: The present study assessed the reproducibility of age at menarche in 6731 women with a wide variation of age when giving the information about age at menarche. The women reported age at ...
    • Risikofaktorer og risiko for hjerte- og karsykdommer 

      Siri, Susanna Ragnhild Andersdatter; Braaten, Tonje; Jacobsen, Bjarne K. (Chapter; Bokkapittel, 2022-03-16)
      Kapittelet beskriver risiko for hjerte- og karsykdommer blant samer og ikke-samer i Nord-Norge og bygger i hovedsak på tre artikler som er inkludert i doktorgradsavhandlingen til Susanna Ragnhild Andersdatter Siri. Datagrunnlaget er informasjon fra spørreskjema, kliniske undersøkelser og blodprøver som ble samlet inn ved helse- og levekårsundersøkelsene SAMINOR 1 og 2, som ble utført i henholdsvis ...
    • Secular trends and correlates of physical activity: The Tromsø Study 1979-2008 

      Morseth, Bente; Jacobsen, Bjarne K.; Emaus, Nina; Wilsgaard, Tom; Jørgensen, Lone (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-12-03)
      <b>Background: </b>The aim was to describe secular trends in leisure time physical activity (LTPA) and work related physical activity (WPA) from 1979 to 2008. Additionally, we explored potential cross-sectional and longitudinal correlates of LTPA and WPA.<br> <b>Methods:</b> Data are collected from 34,898 individuals (49.7% men) aged >20 years who participated in at least one Tromsø Study survey ...
    • Sex differences in mortality among patients admitted with affective disorders in North Norway: A 33-year prospective register study 

      Høye, Anne; Nesvåg, Ragnar; Reichborn-Kjennerud, Ted; Jacobsen, Bjarne K. (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-05-26)
      Objective: Previous studies from North Norway showed significantly increased mortality in patients with schizophrenia and personality disorder. The aim of the present study was to investigate total and cause- specific mortality in inpatients with affective disorder in a 33-year follow- up cohort, with a specific focus on sex differences. <p> Methods: Based on a hospital case register covering all ...
    • Sex-specific time trends in incident atrial fibrillation and the contribution of risk factors: the Tromsø Study 1994-2016 

      Sharashova, Ekaterina; Gerdts, Eva; Ball, Jocasta; Espnes, Hilde; Jacobsen, Bjarne K.; Kildal, Simon; Mathiesen, Ellisiv B.; Njølstad, Inger; Rosengren, Annika; Schirmer, Henrik; Wilsgaard, Tom; Løchen, Maja-Lisa (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-10-14)
      Aims To explore sex-specific time trends in atrial fibrillation (AF) incidence and to estimate the impact of changes in risk factor levels using individual participant-level data from the population-based Tromsø Study 1994–2016.<p> <p>Methods and results A total of 14 818 women and 13 225 men aged 25 years or older without AF were enrolled in the Tromsø Study between 1994 and 2008 and followed ...
    • Smoking and risk of ovarian cancer by histological subtypes: an analysis among 300 000 Norwegian women. 

      Licaj, Idlir; Jacobsen, Bjarne K.; Selmer, Randi; Maskarinec, Gertraud; Weiderpass, Elisabete; Gram, Inger Torhild (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-12-13)
      Background: We prospectively investigated the association between different measures of smoking exposure and the risk of serous, mucinous, and endometrioid ovarian cancers (OC) in a cohort of more than 300 000 Norwegian women. <br>Methods: We followed 300 398 women aged 19–67 years at enrolment until 31 December 2013 for OC incidence through linkage to national registries. We used Cox proportional ...
    • Socioeconomic and geographic differences in ablation of atrial fibrillation in Norway - a national cohort study 

      Olsen, Frank; Uleberg, Bård Erling; Jacobsen, Bjarne K.; Tande, Pål Morten; Bugge, Einar; Balteskard, Lise (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-02-14)
      <p><i>Background -</i> The aim of this study was to analyse whether there are patient related or geographic differences in the use of catheter ablation among atrial fibrillation patients in Norway. <p><i>Methods -</i> National population-based data on individual level of all Norwegians aged 25 to 75 diagnosed with atrial fibrillation from 2008 to 2017 were used to study the proportion treated with ...
    • Total and cause-specific standardized mortality ratios in patients with schizophrenia and/or substance use disorder 

      Heiberg, Ina Heidi; Jacobsen, Bjarne K.; Nesvåg, Ragnar; Bramness, Jørgen Gustav; Reichborn-Kjennerud, Ted; Næss, Øyvind; Ystrøm, Eivind; Hultman, Christina M; Høye, Anne (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-08-23)
      Individuals with schizophrenia or substance use disorder have a substantially increased mortality compared to the general population. Despite a high and probably increasing prevalence of comorbid substance use disorder in people with schizophrenia, the mortality in the comorbid group has been less studied and with contrasting results. We performed a nationwide open cohort study from 2009 to 2015, ...
    • Undiagnosed cardiovascular disease prior to cardiovascular death in individuals with severe mental illness 

      Heiberg, Ina Heidi; Jacobsen, Bjarne K.; Balteskard, Lise; Bramness, Jørgen Gustav; Næss, Øyvind; Ystrøm, Eivind; Reichborn-Kjennerud, Ted; Hultman, Christina M.; Nesvåg, Ragnar; Høye, Anne (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-03-07)
      <p><i>Objective - </i>To examine whether individuals with schizophrenia (SCZ) or bipolar disorder (BD) had equal likelihood of not being diagnosed with cardiovascular disease (CVD) prior to cardiovascular death, compared to individuals without SCZ or BD. <p><i>Methods - </i>Multivariate logistic regression analysis including nationwide data of 72 451 cardiovascular deaths in the years 2011–2016. ...
    • Vekt og overvekt i SAMINOR 

      Jacobsen, Bjarne K.; Melhus, Marita; Kvaløy, Kirsti; Broderstad, Ann Ragnhild (Chapter; Bokkapittel, 2022-03-16)
      De fleste voksne i Norge (75 % av menn og 60 % av kvinner) er nå overvektige eller har fedme; de har kroppsmasseindeks (KMI) ≥ 25 kg/m2. Artikkelen gjør rede for gjennomsnittlig KMI og midjeomkrets og forekomsten av fedme – både generell fedme (KMI ≥ 30 kg/m2) og magefedme (midjeomkrets > 88 cm for kvinner og 102 cm for menn) – i SAMINOR-undersøkelsene som ble gjennomført i 2003–2004 og 2012–2014. ...