scholarly journals Divergent Trends of Lifespan Variation During Mortality Crises

2021 ◽  
Author(s):  
Serena Vigezzi ◽  
José Manuel Aburto ◽  
Iñaki Permanyer ◽  
Virginia Zarulli

Lifespan variation has been attracting increasingly greater attention as a measure of population health and mortality. Several studies have analysed periods of steady mortality decline, highlighting a strong inverse relationship between lifespan variation and life expectancy. Recent research has found that this association weakens, and even reverses, when mortality does not improve equally over age. However, to date no study has comprehensively explored the behaviour of lifespan variation when mortality increases significantly. Analysing three epidemics and two famines in Europe from the eighteenth to the twentieth centuries, we find that, during these events, relative lifespan variation increases, while absolute variation declines, and that subsequently both quickly revert to pre-crisis levels. Using decomposition techniques, we show that mortality at older ages leads to a temporary increase in absolute – but not relative – variation. Moreover, female lifespan variation is less affected by the crises than that of males, because of the higher impact of infant and child mortality on male lifespan variation. By underlining different trends of lifespan variation by sex and indicator, we offer new insight into the consequences of mortality crises. Contrary to what is often asserted, we also show that the choice of lifespan variation indicator is not always inconsequential.

2000 ◽  
Vol 78 (6) ◽  
pp. 748-752 ◽  
Author(s):  
Antonella Cattaneo ◽  
Lucie Fortin

To model the distribution of aquatic mosses, we measured their cover in 33 Quebec streams. The variation in moss cover among streams was explained mostly (42%) by substratum size (percentage >25 cm in diameter). Water pH and depth also explained a significant amount of variation (9 and 10%, respectively). Within a stream, moss cover was again positively correlated to the availability of large substrata and negatively to water depth. There was a strong inverse relationship between covers of moss and of the filamentous cyanobacterium Stigonema, suggesting a competitive interaction. This study confirms previous observations that moss distribution is mainly controlled by substratum size. Chemistry explains part of the among-stream variation. Stigonema-moss competition partly accounts for the patchy distribution within a stream.Key words: aquatic mosses, Fontinalis, streams, Quebec.


1970 ◽  
Vol 22 (3) ◽  
pp. 478-483 ◽  
Author(s):  
C. G. Miles ◽  
N. J. Mackintosh ◽  
R. F. Westbrook

Twenty-eight pigeons were given discrimination training. Four groups were run in which for 0, 2, 4 and 9 sessions of training colour was an irrelevant cue and tone was relevant. Generalization tests were given in extinction; the training colour (C1) and another colour (C2) were presented with tone (T) and noise (N). Responding to these four stimulus combinations, TC1, TC2, NC1 and NC2, allowed the assessment of control by colour and tone. A reduction of control by colour and an increase in control by tone were found to be positively related to the amount of training with colour irrelevant. Tests showed a strong inverse relationship between control by colour and tone.


PLoS ONE ◽  
2012 ◽  
Vol 7 (3) ◽  
pp. e32905 ◽  
Author(s):  
Yong Xu ◽  
Fang Fang ◽  
Daret K. St. Clair ◽  
William H. St. Clair

2019 ◽  
Vol 87 ◽  
pp. 1-70
Author(s):  
Mike Roy ◽  
R Cerón-Carrasco, ◽  
A Craster ◽  
M Cross ◽  
N Crowley ◽  
...  

Archaeological evaluation of the Southern Courtyard of the Parliament House complex, to the south of St Giles’ Cathedral in Edinburgh’s Old Town, has provided a valuable insight into the lives, health and mortality of the inhabitants of the late medieval city. The evaluation revealed a backland area in the centre of medieval Edinburgh, with deposits rich in artefactual and ecofactual material derived from the everyday lives of the populace, underlying early burghal surfaces. The presence of artefacts including a small leather assemblage and a seal matrix may indicate production and trading activities between the High Street and the Cowgate in the late medieval period. Above these surfaces, and underlying fragmentary evidence of the post-medieval Meal Market, numerous late medieval inhumations were recorded; these belonged to the southward expansion of St Giles’ graveyard. This report details the analysis of the skeletal remains, illuminating the health and demography of the population of the city from around the mid-15th to the early-to-mid-16th century.  


1965 ◽  
Vol 65 (1) ◽  
pp. 21-27 ◽  
Author(s):  
M. R. McRoberts ◽  
R. Hill ◽  
A. C. Dalgarno

1. Radioactive phosphorus was injected into young sheep that had been fed diets low in either phosphorus, phosphorus and vitamin D or calcium. Forty-eight hours after the injection the animals were killed and samples of bone and teeth were removed for specific activity determinations.2. The specific activities of bone varied according to the site from which it was taken, but in general a strong inverse relationship was found between specific activity and the quality of the skeleton.3. In teeth that were formed during the period the diets deficient in phosphorus or phosphorus and vitamin D were fed, the specific activities of the dentine and enamel were greater than for corresponding tissues from the control animals.


2014 ◽  
Vol 10 (3) ◽  
pp. 451-470 ◽  
Author(s):  
BRYAN C. MCCANNON

Abstract:Do those who prefer economic freedom behave differently than those who prefer government intervention? Experiments of the Dictator and Trust games are studied. A survey elicits preference for private solutions to potential market failures. Trust and reciprocation are highest for those who score both high and low on the assessment. In the Dictator Game, there is a strong inverse relationship between one's preference for economic freedom and giving. Thus, the results can be interpreted as those with a strong preference for government intervention altruistically give, while those with a preference for economic freedom give primarily in response to wealth-generating investments.


Author(s):  
Kaushik Sinha ◽  
Eun Suk Suh ◽  
Olivier de Weck

Modularity is the degree to which a system is made up of relatively independent but interacting elements. Modularization is not necessarily a means of reducing intrinsic complexity of the system, but it is a means of effectively redistributing the total complexity across the system. High degree of modularization enable reductionist strategies of system development and is an effective mechanism for complexity redistribution that can be better managed by system developers by enabling design encapsulation. In this paper, we introduce a complexity attribution framework to enable consistent complexity accounting and management procedure and show that integrative complexity has a strong inverse relationship with system modularity and its implication on complexity management for engineered system design and development.


1969 ◽  
Vol 28 (2) ◽  
pp. 525-526 ◽  
Author(s):  
Lowell Cooper

Correlations were drawn between behavior (activity) ratings of border-line psychotic inpatients made on an open ward and Rorschach dimensions. Results showed a strong inverse relationship between the behavior ratings and number of M responses and positive correlations between the behavior ratings and both P and F + %.


2017 ◽  
Vol 18 (1) ◽  
pp. 3-15
Author(s):  
Trace Pirtle ◽  
Xuesong Wang ◽  
Randel Brown ◽  
Hanna L. Lainas

This study examined how a special wellness course affects perception of meaning-in-life and state-trait anxiety of Hispanic counselor trainees. A quantitative analysis showed an increase in participants’ perception of meaning-in-life and a concurrent decrease in anxiety. Participants’ self-reports revealed how their perception of meaning-in-life and anxiety levels changed over the course of time. Together, the results confirmed a strong inverse relationship between meaning-in-life and anxiety. The implications and applicability of the study were discussed.


Author(s):  
M.W.A. Slay ◽  
G.O. Eyles ◽  
S.K. Bennie

Management strategies to control Chilean needle grass comprised two re-grassing regimes using the competitive pasture species cocksfoot, combined with lax grazing using sheep or young cattle, no attempted management, and forestry. The presence of Chilean needle grass and cocksfoot densities were assessed by examining 50 mm turf cores taken annually from 1994, and from the forestry site since 1997. There was a strong inverse relationship between Chilean needle grass frequency of occurrence and the sown cocksfoot density. The establishment of cocksfoot and its promotion by lax grazing reduced the frequency of occurrence of Chilean needle grass from 60% in October 1994 to 9% in 1998. Although cocksfoot suppressed Chilean needle grass, eradication appears unlikely or at least a long-time process. In the young pine plantation, Chilean needle grass grew unchecked with 24 and 27% of the cores containing Chilean needle grass in 1997 and 1998 respectively. Under forestry the Chilean needle grass seed bank is likely to develop until canopy closure. Keywords: Chilean needle grass, cocksfoot, Dactylis glomerata, forestry, grazing, Pinus radiata, Stipa neesiana, weed control


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