Search results for "Survivorship curve"

Estimation of fitness from energetics and life-history data: An example using mussels.

2017

Changing environments have the potential to alter the fitness of organisms through effects on components of fitness such as energy acquisition, metabolic cost, growth rate, survivorship, and reproductive output. Organisms, on the other hand, can alter aspects of their physiology and life histories through phenotypic plasticity as well as through genetic change in populations (selection). Researchers examining the effects of environmental variables frequently concentrate on individual components of fitness, although methods exist to combine these into a population level estimate of average fitness, as the per capita rate of population growth for a set of identical individuals with a particul…

Effects of starvation on survival, cannibalism, body mass, and intestinal protozoan profile in the subterranean termite Reticulitermes lucifugus

2019

Scarcity or inadequate nutrition can affect biological and behavioural aspects of subterranean termites and their intestinal protozoan profile. The aim of this study was to investigate changes in survival, cannibalism, body mass, and protist community structure of Reticulitermes lucifugus Rossi subspecies “Sicily” following starvation to provide basic knowledge for the development of more specific studies on a possible survival strategy under stressful conditions. In nature, this termite consumes many food sources and its feeding activity is continuous during the year. In a 35-day laboratory experiment, groups of 50 termites (worker/soldier ratio 49:1) were subjected to two diets, starvatio…

A Twin Protection Effect? Explaining Twin Survival Advantages with a Two-Process Mortality Model

2016

Twin studies that focus on the correlation in age-at-death between twin pairs have yielded important insights into the heritability and role of genetic factors in determining lifespan, but less attention is paid to the biological and social role of zygosity itself in determining survival across the entire life course. Using data from the Danish Twin Registry and the Human Mortality Database, we show that monozygotic twins have greater cumulative survival proportions at nearly every age compared to dizygotic twins and the Danish general population. We examine this survival advantage by fitting these data with a two-process mortality model that partitions survivorship patterns into extrinsic …

Cognitively-Based Compassion Training (CBCT (R)) in Breast Cancer Survivors: A Randomized Clinical Trial Study

2018

Breast cancer (BC) requires a significant psychological adaptation once treatment is finished. There is growing evidence of how compassion training enhances psychological and physical well-being, however, there are very few studies analyzing the efficacy of compassion-based Interventions on BC survivors. Objective. To study the efficacy of the CognitivelyBased Compassion Training (CBCT) protocol in a BC survivor sample on quality of life, psychological well-being, fear of cancer recurrence, self-compassion, and compassion domains and mindfulness facets. Furthermore, enrollment, adherence, and satisfaction with the intervention were also analyzed. Methods. A randomized clinical trial was des…

Psychiatric disorders in childhood cancer survivors in Denmark, Finland, and Sweden: a register-based cohort study from the SALiCCS research programm…

2022

BACKGROUND A childhood cancer diagnosis and treatment-induced somatic late effects can affect the long-term mental health of survivors. We aimed to explore whether childhood cancer survivors are at higher risk of psychiatric disorders later in life than their siblings and the general population. METHODS In this register-based cohort study (part of the Socioeconomic Consequences in Adult Life after Childhood Cancer [SALiCCS] research programme), we included 5-year survivors of childhood cancer diagnosed before 20 years of age between Jan 1, 1974 and Dec 31, 2011, in Denmark, Finland, and Sweden. In Denmark and Sweden, 94��7% of individuals were born in a Nordic country (ie, Denmark, Finland,…

What's past is prologue: Recalled parenting styles are associated with childhood cancer survivors' mental health outcomes more than 25 years after di…

2019

Abstract Background With the increased survival rates of childhood cancer, long-term survivors' well-being over the life span has come into focus. A better understanding of the determinants of childhood cancer survivors' (CCS) mental health outcomes contributes to the identification of vulnerable individuals as well as to the development of evidence-based prevention and intervention efforts. It has been noted that psychosocial factors such as parental rearing behavior shape individual differences in mental health. There is also evidence that parents show altered parenting behavior in the face of childhood cancer, e. g. that they express more emotional support, but also more worries. However…

Psychological distress in lung cancer survivors at least 1 year after diagnosis-Results of a German multicenter cross-sectional study.

2017

The desire for children among adult survivors of childhood cancer: Psychometric evaluation of a cancer-specific questionnaire and relations with soci…

2019

OBJECTIVE Long-term childhood cancer survivors (CCS) are less likely to become parents than their peers of the same age. Previous research has suggested that besides fertility, this outcome is shaped by psychosocial factors such as emotional motives toward having a child. Drawing from a sample of CCS with survival times >25 years, we present the validation of a questionnaire assessing cancer-specific reproductive motives and concerns. METHODS We evaluated the cancer-specific version of the Leipzig Questionnaire of Motives to have a Child (LKM-C) in a register-based sample of adult CCS (N = 632, 31% had children, 44.5% women). We conducted a confirmatory factor analysis and tested associatio…

Parenting in the face of serious illness: Childhood cancer survivors remember different rearing behavior than the general population

2019

Objective A child's cancer diagnosis and treatment affect the whole family. While it has been recognized that parents are an important resource for their children, little is known about the specifics of parenting in the face of serious illness. Methods We used the Recalled Parental Rearing Behavior Questionnaire in a register-based cohort of adult childhood cancer survivors (CCS) (N = 951) and a representative population sample of the same age range (N = 2042). The questionnaire assesses behavior of mothers and fathers with three scales (emotional warmth, rejection/punishment, and control/overprotection) by querying the (former) child. We compared the two groups using general linear models.…

Late mortality among survivors of childhood acute lymphoblastic leukemia diagnosed during 1971–2008 in Denmark, Finland, and Sweden: A population‐bas…

2021

Objective: Investigate all-cause and cause-specific late mortality after childhood acute lymphoblastic leukemia (ALL) in a population-based Nordic cohort. Methods: From the cancer registries of Denmark, Finland, and Sweden, we identified 3765 five-year survivors of ALL, diagnosed before age 20 during 1971–2008. For each survivor, up to five matched comparison subjects were randomly selected from the general population (n = 18,323). Causes of death were classified as relapse related, health related, and external. Late mortality was evaluated by cumulative incidences of death from 5-year survival date. Mortality hazard ratios (HR) were evaluated with Cox proportional models. Results: Among th…