Cohort, generation and time
cohort, generation and time
The horizontal divisions within society, such as cohort, age group and generation,
have had considerably less attention paid to them than the vertical divisions of
class, gender and ethnicity. This may reflect the starker social polarisation that
emerged during the course of industrialisation, a polarisation that preoccupied
the founders of the emergent social sciences. Horizontal divisions within society
may have been recognised but they were not seen as so significant, or as key
Retention of the Cohort:
incentives or inducements
Keeping attrition rates low was crucial to the scientific value of ALSPAC and
has contributed to its outstanding success and international recognition. The
Committee supported ALSPAC staff in their constant endeavour to this end by
keeping the Study participants informed, engaged and enthusiastic. This was
achieved by cultivating media coverage, including publicising scientific papers,
issuing regular participant newsletters, creating the Discovery Club for the Study
children and, where necessary
We review birth cohort studies to examine teen mothers’ life course outcomes.
Birth cohort studies are longitudinal studies that follow people from birth who were born within the same time frame.
The effects of teen mothering on outcomes diminished when strong controls adjusted for selection bias.
Childhood disadvantage showed greater influence on teen mothering in more recent cohorts.
Since the 1970s, when pregnant teens in the US and other high-income countries began to keep and raise their children as single parents, researchers
development of mental health symptoms over the life course, their antecedents and consequences, and the investigation of secular mental health trends require comparable measures within and across cohorts, but with some exceptions (Ploubidis et al, 2017 ) the measurement conditions that allow reliable comparisons have not been investigated.
Valid inference from the investigation of mental health relies – among others – on the assumption of no measurement error. In instances where the error mechanism is known, it can be modelled accordingly (Freedman et al, 2004 ), but
This paper examines strategies used to rebuild a cohort study that had not been contacted in 22 years.
Internet searches of telephone numbers and direct calls were the most effective strategy; social media was of no use.
With limited research funds and no access to government databases, conducting longitudinal studies in Canada is extremely difficult.
In Canada, in contrast to other nations such as the UK and the US, there is a dearth of all kinds of data – so much so that it has even caught the attention of the media
It describes the collection of saliva samples in the Millennium Cohort Study, from cohort members and their resident biological parents.
It analyses response rates and predictors of response.
It details the DNA extraction, genotyping and imputation procedures performed on the data.
The Millennium Cohort Study (MCS) is a large and nationally representative birth cohort study following the lives of children born across the UK around the turn of the millennium ( Connelly and Platt, 2014 ; Joshi and Fitzsimons, 2016 ). Data
This study provides the profile and objectives of the PERSIAN Birth Cohort ongoing in five cities in Iran.
This cohort is one of the first longitudinal studies on the developmental origins of health and disease in the Middle East and North Africa.
It aims to evaluate the effects of gene–environment interactions on pregnancy outcomes and on mother and child mental and physical health.
The cohort aims to assess the life course establishment of risk factors of non-communicable diseases.
The global prevalence of chronic non
parents, such as flexible working hours, financial autonomy and non-standard work schedules ( Ciccia and Bleijenbergh, 2014 ; Pollmann-Schult, 2016 ).
Female employment histories may also vary significantly over time due to changes in cultural, social and economic dimensions, as well as transformations in gender norms. Therefore, another relevant aspect to consider when analysing the configuration of women’s work histories is the cohort to which each woman belongs. As demonstrated in classical life-course studies, studying cohort changes can be a powerful tool for