Sentence examples for because of substantial variation from inspiring English sources

The medical literature is difficult to interpret because of substantial variation in the response and progression criteria used across clinical trials.

Despite reasonable consistency of our findings with those from the existing literature [ 2], a direct comparison of activity levels among women in our study with those from previous investigations is difficult because of substantial variation in the design of physical activity questionnaires across available breast cancer studies.

More important, however, is our demonstration of substantial variation in OP metabolite levels across communities hosting differing agricultural industries, and substantial variation within a community over time.

"However, results also indicate the possibility of substantial variations across regions and even within countries".

They are required particularly because of the substantial variation in the frequency of demographic events and states by age, and because populations vary in size and composition with respect to age and other factors influencing the frequency of events and states.

Because of the substantial variation in substitution rates we observed in our data, we might have expected to reject a molecular clock for each dataset; this was not the case.

Moreover, extrapolation from existing data may prove ineffective because of the substantial variation across different countries, which in turn is related to differences between populations and healthcare systems.

The proliferation of scientific names for this one species occurred because of the terseness of the original description of A. spegazzinii, and a lack of large samples and of appreciation of the substantial variation occurring within A. spegazzinii.

Single-site time-series studies have been criticized because of exposure measurement errors, substantial variation of the air pollution effects and the heterogeneity of the statistical approaches used in different studies [ 13].

Previous studies of HSP70 in humans have identified substantial variation because of a variety of factors (for example, body temperature [ 31]), and the endotoxin-mediated increases in cytokines are known to exhibit large interindividual variations.

However, postoperative pain management is still challenging because of substantial inter-individual variations of pain thresholds, as well as effectiveness of analgesics [4].