PubMed Health⌕ Search

SEARCH · PubMed Health

Results for “Observer Variation”

Explore indexed PubMed citations for clinical trials, systematic reviews and public health research. Read source abstracts and follow each citation to its original PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 325 records · Page 18Linked to original sources
PubMed1980

Experiences with observer variation in mesothelioma panels.

The voting system used in the Dutch Mesothelioma Panel and in those of the European Communities and the IARC in the UK to estimate the probability of the histopathological diagnosis of malignant mesothelioma is described. Five categories are used: A: definite B: probable C: possible D: improbable E: definitely not The voting system facilitates measurement of probability and comparison of opinions, and good or reasonable agreement between panel members is achieved. Second viewing of the slides usually increases agreement. The percentages of dubious diagnoses are less when sufficiently large amounts of tissue are available.

Autopsy↗
PubMed1994

The McKusick-Kaufman syndrome: phenotypic variation observed in familial cases as a clue for the evaluation of sporadic cases.

The characteristic clinical picture of the McKusick-Kaufman syndrome was observed in a girl of Belorussian background. A supernumerary nipple was the only finding not previously described in reported familial cases of this syndrome. In general, the range of phenotypic variability should be the same in both familial and sporadic cases. For this reason we feel that some sporadic cases reported as patients with unusual variants of the McKusick-Kaufman syndrome have more likely "new" genetic syndromes or non-genetic conditions, which only resemble the syndrome. The comparison of the phenotypes of alleged sporadic cases with familial cases of single gene syndromes should be helpful in syndrome delineation, if the number of familial observations is sufficient.

Child↗
PubMed2003

[Classification of observer-groups with cluster analysis and the criteria of visual decision for each group].

It is important that the evaluation of X-ray images include the observer's visual characteristics. However, evaluations of X-ray images that include these characteristics are not performed because of the difficulty of quantitatively elucidating visual characteristics. In this study, we classified observers into groups (clusters) by the same criteria of visual decision, using cluster analysis (unweighted Pair-Group method using arithmetic averages), and evaluated X-ray images on the basis of this separation. Clinical application is also discussed. It was found that observer clustering caused a decrease in between-observer variation. Observers were grouped into two different categories: one with the characteristics of radiologists and the other with the characteristics of medical physicists. Our results indicated that the group with the characteristics of radiologists was suitable for the quality control (QC) of X-ray images.

Cluster Analysis↗
PubMed2003

Genetic analysis of Agrobacterium tumefaciens susceptibility in Brassica oleracea.

The genetic control and heritability of Agrobacterium tumefaciens susceptibility was investigated using a doubled haploid (DH) mapping population of Brassica oleracea and the associated RFLP map. Preliminary studies were carried out by analysis of an 8 x 8 diallel, for which the parental lines were selected to include a range of susceptibilities to A. tumefaciens. The variation observed within the diallel was attributed to both additive and dominant gene effects, with additive gene effects being more important. A broad sense heritability value of 0.95 suggested that 95% of the observed variation was due to genetic effects, with just 5% attributed to non-genetic or environmental effects. A high narrow-sense heritability value of 0.79 suggested that 79% of this trait was controlled by additive gene effects and, therefore, the potential to introduce this trait into breeding material is high. Fifty-nine DH lines from the mapping population were screened for susceptibility towards A. tumefaciens. Variation in susceptibility was observed across the population. The results of the DH screen were entered into the mapping programme MAPQTL and a highly significant quantitative trait loci (QTL) associated with susceptibility to A. tumefaciens was identified on linkage group 09. The use of substitution lines covering this region confirmed the location of this QTL. This work shows that susceptibility to A. tumefaciens is a heritable trait, and the transfer of susceptibility into resistant lines is demonstrated. These findings may help to overcome genotype restrictions to genetic transformation.

Agrobacterium tumefaciens↗
PubMed2001

Effects of infection of common root rot on protein content, cooking quality and other characters in pea varieties.

Pea varieties are known to show a considerable variability in seed yield, protein content, cooking quality and other characters over years and locations. Common root rot, a wide spread soil borne disease of peas in Europe and elsewhere, is a contributing factor in the observed variation in pea yields and pea quality characteristics such as protein content and cooking quality. It interacts with the weather and these factors together constitute important reasons for the variations observed within a single variety in the mentioned characters. The common root rot is, however, in seasons with more moderate deviations from the mean in terms of temperature and precipitation, itself able to constitute the most important source of variation in characteristics of the harvested crop. During the 1980ies and the 1990ies investigations were carried out to study the interactions between common root rot (Aphanomyces euteiches) and peas (Pisum sativum). Seed yield, protein content, cooking quality, hectolitre weight, thousand kernel weight, growing time, duration of flowering time and stem length were all significantly influenced by the fungus.

Cooking↗