6 7 16 17 Although these studies provided useful insights into risk stratification, most were constrained by relatively small sample sizes, reliance on surrogate outcomes, or lack of accurate tools to evaluate RV size and function.
This activity, coupled with their small size and reliance on insects, means that they are very vulnerable to freezing weather.
With 8.5 million breeding pairs the wren is the UK's most common bird, but their small size and reliance on insects mean they perish easily during prolonged periods of cold weather.
These include the common belief that beauty is marked by a large physical size, the reliance on fatty, nutrient-deficient imported foods and a decrease in activity caused by less farming and agricultural work.
Limitations of this study include small sample size and reliance on subjective views of individuals.
Limitations of the present study include its relatively small sample size and reliance on recall of previous hypoglycaemic experiences.
Two occupational cohort studies do not provide consistent evidence for chronic disease; both are limited by sample size and reliance on mortality data.
Our findings suggest that both the overall and daily rate of change in serum PCB concentrations may be associated with reproductive outcome, though cautious interpretation is needed given the limited cohort size and reliance on only two measurements.
Previous research on the effects of tobacco smoke on child outcomes has been limited by small to moderate sample sizes and reliance on parental reports of child exposure.
