Differences in the estimated prevalence among countries may arise through several factors, including different cut-off values for eligibility for disability benefits, different methodologies and data collection, and variations in the quality of the study design.
While considerable inter-observer variation was apparent at the initial stages of data collection, this variation diminished as the study instrument was subsequently modified (See Table 2).
The main limitations of the study concern the choice of study design, the uptake of the practices, the completeness of data collection and variation in laboratory assays to measure PSA.
Second, automated high-content quantification of fluorochrome-labeled biomarkers by LSC offers time-efficient and unbiased data collection without interobserver variations.
Housing officials say the statistics, which are collected annually from more than 3,800 cities and counties, may reflect better data collection and some variation in the number of communities reporting.
Furthermore, differences in mode and timing of data collection could explain variation in estimates between studies.
We analyze disagreements, which are of biological and technical origin: technical imprecision will surely obstruct data collection, but biological variation can also be thought to interfere through alternative splicing mechanisms.
All participants identified considerable between-facility variation in the types of data collected and data collection formats used.
To preclude seasonal variations, data collection was conducted every November.
Third, when the data are organized according to the discipline of the course students were enrolled in at the time of data collection, additional points of variation are evident (see Fig. 3).
The hypothesis of this multicentre study is that a dose management system, with a large amount of data collection, will demonstrate significant variation in dose levels for similar adult CT examinations performed in different institutions in a comparable region of Europe.
