But the case-control and cohort studies
conducted so far are not powerful enough to detect a fat-breast cancer link.
The three prospective cohort studies
incorporated in this analysis were the Prostate, Lung, Colorectal, and Ovarian Cancer Screening Trial, the NIH-AARP Diet and Health Study, and the U.
In a pooled analysis of the cohort studies
, women with history of preeclampsia had a significantly increased risk of cardiac disease (relative risk 2.
of the Harvard School of Public Health, Boston, and colleagues conducted a systematic review and a meta-analysis of prospective cohort studies
to describe the association between depression and risk of total and subtypes of stroke.
The power of cohort studies
depends in part on the accuracy of the exposure assessment.
Toronto, and her colleagues identified a total of nine studies that could be included in their analysis six cohort studies
and three case-control studies--which they analyzed separately.
Ever since analgesic use was first linked to kidney damage, data from several case-control and cohort studies
have raised the possibility" that chronic use could impair kidney function, said Dr.
Of the available studies, 29 were cohort studies
, 69 case-control studies, and 4 randomised clinical trials.
It is not uncommon in occupational cohort studies
to include only subjects with a duration of employment of at least a certain number of months into the cohort.
They also send summaries of their findings--in English and Spanish--to all the mothers involved in these cohort studies
This was a central finding of his metaanalysis of eight large case-control and five cohort studies
Although other cohort studies
reported fewer cases of nasopharyngeal cancer than expected (Coggon et al.
2002) analyzed 44 case-control studies and 4 cohort studies
on smoking and 8 case-control studies and 5 cohort studies
on coffee drinking.
1988), and cohort studies
found differences in neuromotor function and childhood behavior between patients who developed schizophrenia and the general population.
In Europe, there is a long tradition of birth cohort studies
that extend decades into adulthood, with recent investments in new birth cohorts by the United Kingdom and planning for a "mega" cohort by the European Union (Kogevinas 2002).