A systematic review investigated the association between the timing of introducing complementary (solid) foods and childhood obesity in 23 primarily cross-sectional and cohort studies
(17 from the United States, Canada, and Europe) with more than 33,000 patients.
Statistical analysis: For all the included cohort studies
, we computed overall RRs with 95% CIs for the highest versus lowest level of coffee consumption.
Another major area in which cohort studies
provide material for economists is the study of gender issues in the labour market, represented here by the paper by Dex and Bukodi on women's occupational histories3 After an outline of the contributors' results, the reader will find more information about the history, content and future of the studies.
Because the true incidence of meningococcal infection among coinfected patients is unknown, future cohort studies
will have to establish the impact of coinfection with HIV and HCV on the risk for meningococcal infection.
That's because AIDS cohort studies
mostly look back in time, telling you what happened years ago, not what's happening now.
In fact, the case-control and cohort studies
described in "Non-Trivial Pursuits" yielded little support for the link.
Rotimi's team has conducted a number of family-based cohort studies
on African populations.
This is the result of an analysis of three large cohort studies
published in the Annals of Internal Medicine.
To address conflicting data on whether azathioprine increases the risk of skin cancer, the authors con ducted the analysis of 27 studies (23 cohort studies
, 1 randomized study, and 3 case-control studies) published between 1996 and 2011, which evaluated skin cancer risk associated with azathioprine in people who received an organ transplant from 1963 to 2011, at a median age of 38-54 years.
Other research using data from the Centre for Longitudinal Studies cohort studies
is also underpinning the Child Obesity Strategy, including the Millennium Cohort Study.
It included 7 prospective cohort studies
, which comprised the best quality evidence available (numerous other reviewed studies were of lower quality).
Researchers systematically reviewed prospective cohort studies
with relative risk and 95% confidence intervals for breast cancer according to fish intake, n-3 PUFA intake, or tissue biomarkers.