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K Bergmann

Publications and source records attributed to K Bergmann.

104 records · Page 6Linked to original sources
PubMedDate not supplied

Fluoride and dental caries: two different statistical approaches to the same data source.

A recent analysis of data from earlier papers on the relationship between dental caries and drinking water fluoride concentration suggested that the commonly accepted inverse relationship did not exist. Our reanalysis of those data, however, confirms the well-known association between fluoride concentration and dental caries. It also shows that the contrary result arose misleadingly from three simultaneous methodological errors: use of a unifactorial instead of a multifactorial model; omission of or over-aggregation of some data, and analysis of homoscedastic probits instead of heteroscedastic counts.

Data Interpretation, Statistical↗
PubMedDate not supplied

[The effects of methodical factors on the microphonic potential in the guinea pig cochlea with perfusion of perilymph].

The decreas in microphonic potentials detected from the round window (RMP) is negligible only if the bores are located very close to the round window, whereas it will increase with increasing distance from it. Only at pressures of more than +/- 30 cm water column, in rare cases even below that, will a sharp decrease in the RMP occur, possibly because of a lesion of either the oval or the round windown membrane. At a perfusion pressure above +5.6 cm water column, the perfusion liquid will enter the cerebrospinal fluid space. At a lower pressure the perfusion liquid is diluted by cerebrospinal fluid via the cochlear aqueduct. The perfusion speed of 1 to 50 mul/min has no effect on the function of the organ of Corti.

Action Potentials↗