| 51. |
- Nilsson, Johan, et al.
(author)
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Predictability of food supply modulates nocturnal hypothermia in a small passerine
- 2020
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In: Biology letters. - : The Royal Society. - 1744-957X .- 1744-9561. ; 16:6
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Journal article (peer-reviewed)abstract
- The combination of short days and long cold winter nights, in temperate regions, presents a major challenge for small diurnal birds. Small birds regularly employ heterothermy and enter rest-phase hypothermia during winter nights to conserve energy. However, we know little about how environmental conditions, such as food availability, shape these strategies. We experimentally manipulated food availability in winter to free-living great titsParus major. A ‘predictable' and constant food supply was provided to birds in one area of a forest, while birds in another area did not have access to a reliable supplementary food source. We found that predictability of food affected the extent of nocturnal hypothermia, but the response differed between the sexes. Whereas male nocturnal body temperature was similar regardless of food availability, females exposed to a naturally ‘unpredictable' food supply entered deeper hypothermia at night, compared with females that had access to predictable food and compared with males in both treatment groups. We suggest that this response is likely a consequence of dominance, and subdominant females subject to unpredictable food resources cannot maintain sufficient energy intake, resulting in a higher demand for energy conservation at night.
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| 52. |
- Nilsson, Jan Åke, et al.
(author)
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2021 a new beginning
- 2021
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In: Journal of Avian Biology. - : Wiley. - 0908-8857 .- 1600-048X. ; 52:1
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Journal article (other academic/artistic)
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| 53. |
- Nilsson, Jan-Åke, et al.
(author)
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Heritability of resting metabolic rate in a wild population of blue tits.
- 2009
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In: Journal of evolutionary biology. - : Wiley. - 1420-9101 .- 1010-061X. ; 22:9, s. 1867-1874
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Journal article (peer-reviewed)abstract
- We report the first study with the aim to estimate heritability in a wild population, a nest box breeding population of blue tits. We estimated heritability as well as genetic and phenotypic correlations of resting metabolic rate (RMR), body mass and tarsus length with an animal model based on data from a split cross-fostering experiment with brood size manipulations. RMR and body mass, but not tarsus length, showed significant levels of explained variation but for different underlying reasons. In body mass, the contribution to the explained variation is mainly because of a strong brood effect, while in RMR it is mainly because of a high heritability. The additive variance in RMR was significant and the heritability was estimated to 0.59. The estimates of heritability of body mass (0.08) and tarsus length (0.00) were both low and based on nonsignificant additive variances. Thus, given the low heritability (and additive variances) in body mass and tarsus length the potential for direct selection on RMR independent of the two traits is high in this population. However, the strong phenotypic correlation between RMR and mass (0.643 +/- 0.079) was partly accounted for by a potentially strong, although highly uncertain, genetic correlation (1.178 +/- 0.456) between the two traits. This indicates that the additive variance of body mass, although low, might still somewhat constrain the independent evolvability of RMR.
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| 54. |
- Nilsson, Martin P., et al.
(author)
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High patient satisfaction with a simplified BRCA1/2 testing procedure : long-term results of a prospective study
- 2019
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In: Breast Cancer Research and Treatment. - : Springer Science and Business Media LLC. - 0167-6806 .- 1573-7217. ; 173:2, s. 313-318
-
Journal article (peer-reviewed)abstract
- Purpose: In the BRCAsearch study, unselected breast cancer patients were prospectively offered germline BRCA1/2 mutation testing through a simplified testing procedure. The purpose of the present study was to evaluate satisfaction with the BRCAsearch testing procedure and, furthermore, to report on uptake rates of prophylactic surgeries among mutation carriers. Methods: Pre-test information was provided by a standardized invitation letter instead of in-person genetic counseling. The patients were offered contact with a genetic counselor for telephone genetic counseling if they felt a need for that. Mutation carriers were telephoned and given a time for a face-to-face post-test genetic counseling appointment. Non-carriers were informed about the test result through a letter. One year after the test results were delivered, a study-specific questionnaire was mailed to the study participants who had consented to testing. The response rate was 83.1% (448 of 539). Results: A great majority (96.0%) of the responders were content with the method used for providing information within the study, and 98.7% were content with having pursued genetic testing. 11.1% answered that they would have liked to receive more oral information. In an adjusted logistic regression model, patients with somatic comorbidity (OR 2.56; P = 0.02) and patients born outside of Sweden (OR 3.54; P = 0.01) were more likely, and patients with occupations requiring at least 3 years of university or college education (OR 0.37; P = 0.06) were less likely to wanting to receive more oral information. All 11 mutation carriers attended post-test genetic counseling. At a median follow-up of 2 years, the uptake of prophylactic salpingo-oophorectomy was 100%, and the uptake of prophylactic mastectomy was 55%. Conclusions: Satisfaction with a simplified BRCA1/2 testing procedure was very high. Written pre-test information has now replaced in-person pre-test counseling for breast cancer patients in our health care region.
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| 55. |
- Nilsson, Martin P., et al.
(author)
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Written pretest information and germline BRCA1/2 pathogenic variant testing in unselected breast cancer patients : predictors of testing uptake
- 2019
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In: Genetics in Medicine. - : Elsevier BV. - 1098-3600. ; 21:1, s. 89-96
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Journal article (peer-reviewed)abstract
- Purpose: This study aimed to evaluate predictors of testing uptake among unselected breast cancer patients who were offered germline BRCA1/2 testing in a prospective study. Methods: Pretest information was provided by a standardized invitation letter instead of in-person counseling. Data was abstracted from medical records. Using multivariate logistic regressions, predictors of testing uptake were analyzed. Results: The overall uptake of testing was 67% (539 of 805 patients). Low uptake rates were found for patients aged ≥80 years (33%), and patients born outside of Europe (37%). In adjusted analysis, age ≥80 years (odds ratio [OR] 0.10; P = 0.002), psychiatric disorders (OR 0.46; P = 0.006), occupation requiring at least 3 years of university or college education (OR 2.03; P = 0.003), and breast cancer or ovarian cancer in first-degree or second-degree relatives (OR 1.66; P = 0.02) were independently associated with uptake of BRCA1/2 testing. Somatic comorbidity in patients aged <70 years was associated with lower testing uptake. Conclusion: Testing uptake varies across different subgroups according to patient-related factors that are readily available in the medical records. Knowledge about these factors enables health care professionals to identify patients who are less likely to pursue genetic testing.
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| 56. |
- Nilsson, Peter, et al.
(author)
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Adverse social factors predict early ageing in middle-aged men and women: the Ebeltoft Health Study, Denmark.
- 2003
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In: Scandinavian Journal of Public Health. - : SAGE Publications. - 1651-1905 .- 1403-4948. ; 31:4, s. 255-260
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Journal article (peer-reviewed)abstract
- Aims: This study examined whether adverse social factors are associated with an increased rate of biological ageing in middle-aged subjects. Methods: The authors investigated five markers of biological ageing in 690 subjects followed for five years in Ebeltoft, Denmark. Mean age at baseline was 40 years (range 30 - 50 years). These markers included repeated measures of pulse pressure, lung function, hearing, physical work capacity and a cardiovascular risk score. A z-score was calculated based on a factor analysis of the five markers used. The relative biological age was finally calculated in relation to chronological age in subgroups of different social class (occupation, educational level) and marital status, at baseline and after follow-up. Results: Men and women from a higher social class appeared to be biologically younger than corresponding subjects from a lower social class (p<0.001). This difference was still evident after 5 years of follow-up (p<0.01) for men and women of different occupations and for women of different educational levels (p<0.01). Married/cohabiting men were biologically younger than single men and this difference increased during the follow-up period in that the difference between groups at five-year follow-up was significant (p<0.05). Conclusions: Middle-aged men and women from a higher social class showed signs of being biologically younger than their corresponding chronological age, while the opposite was found for men and women of lower social class. This discrepancy was still evident after five years of follow-up, and even tended to increase for single men. Differential ageing may thus be an important biological aspect of differences in health according to social class.
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| 57. |
- Nilsson, P, et al.
(author)
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Hyperinsulinaemia as long-term predictor of death and ischaemic heart disease in nondiabetic men: The Malmö Preventive Project.
- 2003
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In: Journal of Internal Medicine. - : Wiley. - 1365-2796 .- 0954-6820. ; 253:2, s. 136-145
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Journal article (peer-reviewed)abstract
- Objectives. Prospective studies have indicated that hyperinsulinaemia/insulin resistance is a risk factor for ischaemic heart disease (IHD), the risk decreasing with time of follow-up. Few studies have so far investigated the role of hyperinsulinaemia in the prediction of long-term total mortality. Setting. Section of Preventive Medicine, Department of Medicine, University Hospital, Malmö, Sweden. Subjects. A total of 6074 nondiabetic, middle-aged, healthy Swedish males. Screening examination. We determined IHD risk factors including blood glucose and plasma insulin before and 2 h after an oral glucose tolerance test (OGTT). Total follow-up time was 19 years. Hyperinsulinaemia was defined as values above the 10th decentile of fasting or 2 h insulin concentration. Main outcome measures. Total mortality and cardiac event (CE) rate for IHD. Results. Unadjusted relative risks (RRs) for both death and CE were J-shaped with the highest relative risk (RR: 1.4-1.6) in the hyperinsulinaemic group compared with all other men. The RRs for death and CE were significant for fasting insulin but became nonsignificant after adjustment for other risk factors and also with a longer follow-up. The risk of death in hyperinsulinaemic men, defined on the basis of 2-h insulin level, increased with time of follow-up and was still significantly increased after 19 years [RR: 1.32 (95% CI: 1.05-1.65], even after adjustment for other risk factors. Conclusions. Fasting hyperinsulinaemia was a predictor of total mortality and IHD in nondiabetic men, although not more significantly after adjustment for other risk factors and with lengthening of follow-up time. The 2-h postglucose hyperinsulinaemia appeared to be a stronger and independent predictor of mortality over long-term follow-up. These findings support the view that insulin resistance with associated cluster of risk factors predicts increased long-term risk of mortality and IHD.
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| 58. |
- Nilsson, P M, et al.
(author)
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Family burden of cardiovascular mortality: risk implications for offspring in a national register linkage study based upon the Malmö Preventive Project.
- 2004
-
In: Journal of Internal Medicine. - : Wiley. - 1365-2796 .- 0954-6820. ; 255:2, s. 229-235
-
Journal article (peer-reviewed)abstract
- Objective. To investigate the adjusted relative risk of cardiovascular disease (CVD) events in offspring of parents with cardiovascular mortality before 75 years. Setting. The city of Malmö, Sweden. Design. A follow-up study based on register linkage analyses. Subjects and methods. In the Malmö Preventive Project (MPP), a total of 22 444 men and 10 902 women attended the screening programme between 1974 and 1992. At the screening conventional risk factors for CVD were measured (blood pressure, lipids, glucose, smoking and social class). Main outcome measures. Parental CVD mortality was determined via register linkage analysis between the Multiple-Generation Register and the National Mortality Register (NMR). CVD events (morbidity and mortality) in offspring were collected from national registers. The relative risk for CVD events in offspring, in relation to parental CVD mortality, was adjusted for age and risk factors at screening. Results. The age-adjusted relative risk (RR; 95%CI) for a son to experience a CVD event was increased in relation to a maternal positive family history of CVD mortality before 75 years when compared with no maternal history, RR 1.74 (1.43-2.11). This RR decreased to 1.51 (1.23-1.84; P < 0.001) after full adjustment for risk factors. The corresponding fully adjusted RRs for father-son heritage was RR 1.22 (1.02-1.47; P < 0.05), mother-daughter RR 0.87 (0.54-1.41), and father-daughter RR 1.20 (0.83-1.73). Conclusion. The existence of maternal CVD mortality before the age of 75 years implies a substantial risk increase for CVD morbidity and mortality in sons that cannot be explained by social background, lifestyle, or conventional cardiovascular risk factors in the adult offspring.
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| 59. |
- Nilsson, P M, et al.
(author)
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Population-attributable risk of coronary heart disease risk factors during long-term follow-up: the Malmö Preventive Project.
- 2006
-
In: Journal of Internal Medicine. - : Wiley. - 1365-2796 .- 0954-6820. ; 260:2, s. 134-141
-
Journal article (peer-reviewed)abstract
- Aims To calculate the population-attributable risk (PAR) of coronary events (CE) from 10 risk factors, during long-term follow-up. Methods We used both case-cohort and case-control analyses for calculation of PAR in relation to 10 baseline risk factors. First CE (fatal or nonfatal, n = 3072) in 22 444 males and 10 902 females was recorded during a mean follow-up of 20 years by use of national registers. Results Using a Cox regression analysis in a case-cohort design, smoking (prevalence in men 49%, women 37%) was the strongest risk factor, RR 2.29 (95% CI 2.09-2.52; PAR 39%), followed by hypercholesterolaemia, RR 1.70 (95% CI 1.56-1.86; PAR 18%), and diabetes, RR 1.67 (95% CI 1.41-1.99; PAR 3%). For women the strongest risk factors were smoking, RR 3.16 (95% CI 2.50-3.98; PAR 44%), diabetes, RR 2.59 (95% CI 1.78-3.76; PAR 6%), and hypertension, RR 2.47 (95% CI 1.94-3.14; PAR 23%). In men, smoking was the strongest predictor both after 10 years [RR 2.69 (95% CI 2.23-3.24)] and 20 years [RR 2.45 (95% CI 2.15-2.79)], followed by hypercholesterolaemia (RR 2.16-1.63), hypertension (RR 2.04-1.51), and diabetes (RR 1.85 -1.47). The case-control design gave very similar results. Total PAR varied from 74% (fully adjusted Cox regression, case-control, in men) to 116% in women (case-cohort). Conclusion Smoking is the most important long-term risk factor for CE in both genders, based on data from a population with a high proportion of smokers. Ten measured variables explained almost all variation in risk and could be used as a basis for intervention programmes.
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| 60. |
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