Sentence examples for by variation in study from inspiring English sources

The quality of evidence was limited by variation in study design, heterogeneity of details regarding treatment and outcomes, limited follow-up, and small sample sizes.

Investigation in this area is limited by small sample sizes, primarily due to difficulty in obtaining tissue samples, and by variation in study protocols and result interpretation.

The review may be limited by variation in study quality, especially with the earlier publications having lower STROBE scores (as is often seen when comparing older with more recent studies due to different standards).

However, comparisons of response rates across these studies are complicated by variations in study design and in patients' baseline characteristics.

Inconsistencies among studies are again likely to be caused by variations in study methodology, particularly lack of detailed exposure assessment in some earlier studies.

Although our results conflict with two other recent studies of blood PCB concentration and secondary sex ratio, the discrepancy between these studies and ours may be explained, in part, by variations in study design and population.

Comparability between studies is hampered by use of a range of different measures and by variations in study design, although there are clear anti-TNF class effects with relatively small differences in efficacy between agents.

However, prevalence results originating from other studies performed in Switzerland were significantly lower than our result which might be explained by variations in study design and definition of diagnosed diabetes.

However, comparisons of incidence rates for IS among different regions should be careful as these rates may be affected by variations in study methods, differences in genetic and lifestyle factors, and health care practices.

It could be also partially explained by variation in the study subjects, for instance, the report from Zambia was limited to urban residents unlike the current study which included rural residents too.

Though estimates are hampered by the variation in study population and study design, depression was generally found to approximately double the risk of crash risk.