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"Even the strongest studies have proved difficult to replicate," John Martin, an expert on brain and spinal-cord injury at the CUNY School of Medicine, points out.
But in the strongest studies (19 double-blind trials with good randomization and follow-up), supplements in doses considerably larger than those in typical multivitamin pills appeared to increase the risk of death, by 16percentt for vitamin A, 7percentt for beta carotene, and 4percentt for vitamin E. It made no difference whether the groups tested were healthy or ill.
Only five studies explored delay of gratification, of which the two methodologically strongest studies found no group differences.
Weight Watchers had the strongest studies to support effectiveness, said study co-author Wadden, a professor of psychology and director of the Weight and Eating Disorders Program at the University of Pennsylvania School of Medicine.
The other strength is we based our review on the strongest studies available, RCTs.
We identified the strongest studies available, using a range of criteria tailored to the review methodology.
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The strongest study, a prospective study in children, found consistently increased ORs up to 2.9 for prenatal mold exposure to infants with no parental atopic history.
The study by Schulze et al. (16), which is the largest and which used repeated measures of SSB intake, reported the strongest study-specific estimate.
With regards to the ability to delay gratification, the two methodologically stronger studies found little evidence of group differences.
The methodologically strong studies in this area were Strakowski et al. (2010) and Martino et al. (2011).
In conclusion, the findings were more mixed than expected, though sufficiently strong studies exist to provide lessons for future research.
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CEO of Professional Science Editing for Scientists @ prosciediting.com