Also, there are limited results on the effect of games on student self-efficacy, with one study demonstrating moderate post-training self-efficacy (Sitzmann, 2011).
Helmets may be most helpful to children, with one study showing a halving in head injuries for those under 10.
These studies measured four different MDROs with one study showing a reduction in transmission.
Respiratory illness appears to be increasing along with the pollution in densely populated South Asia, with one study suggesting 500,000 premature deaths annually in India.
At first glance, some research suggests there may be a link, with one study showing that obese women tended to eat later in the day than slimmer women.
With one study after another showing the benefits of early childhood education, a growing number of states are creating and expanding school programs for 4-year-olds.
The retooled campaign had stronger results, with one study of over 4,000 adolescents showing that it reduced teenage marijuana use.
The program has proven beneficial, with one study showing a $1,000 increase in EITC results in more than a 7percentt increase in employment for some families.
The rate of plastic pollution is steadily increasing worldwide, with one study last year estimating that about eight million metric tons of plastic - enough to cover every foot of coastline in the world - is enters the oceans annually.
"But the evidence shows that it actually made them more likely to offend, with one study finding that every dollar spent resulted in a $200 to $300 future cost to the criminal justice system".
There is some experimental evidence to back this up, with one study showing that 20% of those who self-described as "highly straight" indicated some level of same-sex attraction.
