English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Determination of serum totalcholesterol was part of the longitudinal health screening programme carried out in the majority of counties in Norway 1974-2001. The analytical method for cholesterol determination was subjected to an excessive internal and external quality control. Commercial quality control sera with given cholesterol values were analysed several times every day. Samples received from WHO Regional Lipid Reference Centre in Prague were analysed frequently. Samples received from the Lipid Research Clinic, George Washington University, USA, from the National Bureau of Standards, USA, and from the Danish laboratory using ”high performance methods” were also analysed. Further the laboratory participated in the Norwegian laboratory control system. It was unveiled that the analytical level dropped by 8 per cent in 1979 when the enzymatic method replaced the non-enzymatic method. The results obtained by the enzymatic method were in better agreement with those found with high performance methods than those found with the non-enzymatic method. The results obtained before the shift of method were recalculated in order to bring them in accordance with those after the shift. Shift in instrument in 1997 could have caused an increase in the analytical level by 2 per cent. The instrument was therefore adjusted to keep the analytical level constant. Thus the control system documents that the analytical level in the determination of totalcholesterol – after adjustements – has been constant during the period 1974-2002. The observed drop in mean totalcholesterol among Norwegians during this period is real and not caused by analytical unstability.

Kolesterol gjennom mer enn 25 år: Kan svarene sammenliknes over så lang tid?