However, these rich theoretical discourses are not reflected in the bulk of the empirical literature, which, despite its breadth with respect to the sectors and categories of evidence types studied, finds fairly consistently that the main factors affecting use of evidence are (a) access to relevant and clear information and (b) good relationships between researchers and research users.
Coding of the study design, intervention components, and categories of interest in each study were completed and κ and intraclass correlation coefficients were all 1.00.
In order to increase the impact of policies, the following broad categories of study and organisational reform can be suggested: First, much as it is easy to call for a coherent approach to policy instruments, practice is more difficult.
Table 1 shows the basic characteristics of the study population and the mean number of missing teeth as well as the proportion of those who were missing at least one tooth according to the categories of study variables and smoking status.
However, comparisons of the median intake of total protein and total iron in the quintiles used in the present study (Table 2) with the tertiles of intake in the EPIC study [ 15] demonstrate that the range and categories of intake in the two studies were similar.
The dietary patterns in the included articles were derived by using the principle component factor analysis, which was a subjective technique and might increase variation at almost every step (e.g., a variation in the number, type of dietary patterns derived within each study and categories of dietary patterns score) (Martinez et al, 1998; Jacques and Tucker, 2001).
There were three main categories of study outcomes: patient-related outcomes, provider-related outcomes, and health service access and utilization outcomes.
Two main categories of study quality were included in the quality assessment tool; content quality and formal quality.
