Other studies, such as the LEMMoN 28 study in the Netherlands, the recently started Nordic project (NOSS) or the French Severe maternal morbidity: measurement, determinants and quality of care project (EPIMOMS), are prospective but transversal approaches limited to a specific time period.
Appropriate methods for rating symptoms as EMF-related are required, taking into consideration measurement determinants that have been proposed by the broader research field of medically unexplained symptoms such as population type, use of validated symptom checklists and frequency, severity and duration of the symptoms [ 48].
The brief illness perception question provides a practical and comprehensive measurement of determinants identified in Leventhal's common sense model [ 27], one of the key theoretical models underpinning the content and structure of the education programme.
The reviews recommend more research with better measurements of determinants and outcomes and more sophisticated techniques to analyse the association with disease outcomes.
In linear regression analyses with repeated measurements, the determinants of improvement in physical health were evaluated by introducing interaction terms of the initial physical health values, expressed as categorical variables, with time of measurement as fixed effects in the analysis.
In that particular study vitamin D status was analyzed based on serum 25(OH D measurements, its determinants and health correlates in a representative sample of 4030 German adults, 1763 men and 2267 women.
There were following possible random errors on measurements of determinants: The history of ethnic group was generally very accurate because only Aboriginals were entitled to a complete waiver for partial co-payment if treated by a doctor.
It is found that at low Reynolds numbers flow rate and pressure drop measurements are determinant for the final value of the uncertainty, while at larger Reynolds numbers the influence of the accuracy in measuring the hydraulic diameter prevails and also limits the minimum value that the total uncertainty can take.
However, it should be pointed out that this accessibility measurement has certain determinants and that it is necessary to be aware of these, otherwise its soundness and plainness may be obscured.
The measurement of social determinants of health and knowing how to address them will be especially critical in the post-MDG world.
Two authors (ROC and AJvB) independently extracted the study characteristics (author, year, outcome variable(s), sample characteristics, presumed determinants, measurement instruments, and significant results (statistical figures that were reported in the article), of studies selected for inclusion.
