However, the authors employed different definitions of AC structures and discuss restricted comparability as a critical point.
Such differences restrict the comparability of the respective samples, while a number of studies emphasize that neither age nor schooling can be neglected.
Furthermore, progress in medical diagnostics and improved access to health care restrict the comparability.
While this approach is valuable in describing the available evidence from a wide perspective, it restricts the comparability across studies.
The different methods used to select patient groups may lead to different populations (with limited generalisability) and different data-collection procedures, and therefore may restrict the comparability.
Other reasons may as well restrict the comparability of the included studies: - The different economic evaluations are based on different health care settings and legislations, e.g. the Canadian Medicare system, the National Health Service (NHS) in the United Kingdom or the German Statutory Health Insurance setting.
did play main role in these previous studies, and the population in 2011 study was restricted to have comparability of H. pylori seroprevalence.
Sensitivity analyses, restricting the number of comparisons to increase comparability of study design, settings, therapy, and baseline scores, had only small effects on the results.
Restricting the investigation to first-time parents improves the comparability of the stability levels of cohabitation and marriage, and it ensures that groups, rather than life course stages, are analyzed.
Although censuses are the most reliable source of time-series data on these Indigenous populations, there are some problems with the comparability of populations between countries and between years, restricting our examination to the 1990s.
