These indexes, however, involve serious problems of comparability between countries and regions, especially since even the most basic data, such as reliable population estimates, may be unavailable for some very poor countries.
Thus, potential problems of comparability across countries remains unsolved as with the measures of odds ratios.
To circumvent these problems of comparability Bell proposes using certain conventional measures of migration intensity and Courgeau's k index- a statistic which adjusts migration intensity for differences in statistical geography as described below [ 32].
Finally, the utilization of two different analyzers creates a possible problem of comparability.
We partly overcame this problem of comparability with the general population by not including deaths from liver disease in HIV-infected persons as deaths from AIDS.
(i) A problem is that the focal length needs to be respected (between 80 and 120 cm), with the risk of image distortion as a penalty (computer contouring difficulties occur in these conditions) and the problem of comparability of results.
A widespread application of OPN measurement in patient plasma or serum is dependent on the availability of reliable commercial enzyme-linked immunosorbent assay (ELISA) systems and may be affected by the problem of comparability between results of different assay systems.
In summary, despite the well-known problem of comparability of all studies in the field of multiple-trauma patients, the large fluid volumes of our study confirm the actuality of traditional pelvis-specific trauma algorithms [ 14, 18].
To overcome the problem of comparability of self-report health data, the WHO survey instrument used anchoring vignettes to calibrate self-reported health for the 6 core health domains (mobility, self care, pain, affect, work and household activities, cognition) and vision.
Various definition of healthcare use can be identified ranging from specific interventions such as "suturing" to unspecific terms such as "medical treatment" or "urgent physician visits"and this exacerbates problems in comparing comparability of study outcomes.
To overcome the problem of data comparability, the in-hospital Utstein style data collection recommendations were published in 1997 and revised in 2004 [4].
