Sentences with phrase «few experimental studies»

Despite reports of positive effects of high - quality child care, few experimental studies have examined the process of improving low - quality center - based care for toddler - age children.

However, few experimental studies have been conducted to demonstrate the value of this approach in math classrooms.

In the 1990s James Gilardi, executive director of the World Parrot Trust, found support for the detoxification hypothesis in one of the few experimental studies on geophagia.

Responsive parenting, according to many descriptive studies and fewer experimental studies, is an important process for supporting young children's learning.

Not exact matches

There is experimental evidence that this old standby really helps: In a study that randomly assigned fearful children to receive a toy «huggy puppy,» kids exhibited fewer nighttime fears and sleep problems than did children in a control group.

A few longitudinal studies, along with a small number of experimental studies, have recently emerged allowing an improved estimate of the causal impact of parenting behaviour on emotional health.

The sample sizes of both studies were small — fewer than 20 experimental subjects each.

Because the subjects in these closely watched studies are at such a high risk, researchers should know within the next few years if the experimental drugs will halt or delay the onset of the disease.

To tease out these links, Clive Jones and Richard Ostfeld's team at the Institute of Ecosystem Studies in Millbrook, New York, and Jerry Wolff of Oregon State University in Corvallis first showed by trapping mice in experimental forest plots that fewer mice means much greater survival rates for gypsy moth pupae.

The study, supported by grants from the National Institutes of Health and the U.S. Centers for Disease Control and Prevention, assigned each cluster to one of three experimental options: a control group (meaning no treatment); a basic cleanup; or a «cleaning and greening» treatment, including a lawn, a few trees and a low perimeter fence — «to show that the lot was cared for and to deter illegal dumping.»

With the help of some designing, a few grams of plastic filament and a 3D printer, researchers in the University of Helsinki made a unique device for studying chemical reactions, and improved their experimental processes.

Just a few weeks ago, WHO said that using any of the experimental drugs or vaccines in the pipeline simply wasn't in the cards, because none of them have been through a phase I clinical study, the type of trial in which medical products are tested on healthy volunteers to study their toxicity.

Previous experimental studies have shown that a few minutes» worth of violent video game play can influence a person's levels of aggression and willingness to help others.

The whole animal studies suggest that the experimental drug could have fewer side - effects than current treatments.

«Good sleepers» recover better from ultraviolet light exposure and also showed fewer signs of aging, according to a study in Clinical and Experimental Dermatology.

Experimental studies, although few and involving small numbers of children, show similar effects.

In addition, «relatively few studies rely on experimental designs that enable us to attribute differences in student achievement and teacher retention solely to the compensation program, and not to other characteristics of the teachers, schools, or districts» (Glazerman).

These climate - related land storage effects could be significant for global sea - levels, though unfortunately there seem to be very few direct experimental measurements of the factors involved, and so the only studies of these effects seem to have been from computer modelling of data from weather data «reanalysis» models (e.g., ERA - 40).

Very few experimental approaches have assessed ecosystem responses to multi-factorial treatments such as listed above (Norby and Luo, 2004), and experiments on warming, rainfall change or atmospheric CO2 level are virtually absent in savannas, with many ecosystem studies confined mainly to temperate grasslands (Rustad et al., 2001).

Despite decades of research describing the harmful effects of family poverty on children's emotional and behavioral development, eg,12 - 17 experimental or quasi-experimental manipulations of family income that could go beyond description are rare18 and tend to examine the effect of such manipulations on physical health or academic attainment, rather than emotional or behavioral functioning.19, 20 Other analyses of the Great Smoky Mountains data set have focused on educational and criminal outcomes.21 The few studies looking at emotional or behavioral outcomes tend to have a short time frame.22, 23 Some studies of school - based interventions have followed up with children through to adulthood, 24,25 but we have found none that have looked at the long - term effects of family income supplementation on adult psychological functioning.

A randomized trial of Early Head Start found that a treatment group received more hours of care and had fewer behaviour problems in the preschool years.23 Other experimental preschool studies have found lower rates of behaviour problems, conduct disorder, delinquency, and crime into adulthood among subjects placed in child care earlier in life.9, 24

A few longitudinal studies, along with a small number of experimental studies, have recently emerged allowing an improved estimate of the causal impact of parenting behaviour on emotional health.