Cervical screening, for example, is thought to be more effective in detecting squamous cell than adenocarcinomas (Mitchell et al, 1995; Bergstrom et al, 1999); while all studies in this meta-analysis provided results adjusted for screening, the extent of adjustment was variable.
There was no evidence of heterogeneity by any specific characteristic, including extent of adjustment, 7 of the 14 estimates being adjusted for one or more of aspects of smoking.
Data extracted included 1) the study design used, 2) the number of included patients, 3) the type of disease (or end point), 4) the number of control subjects, 5) the type of control subjects, 6) the follow-up duration, 7) the crude and adjusted ORs (and 95% CI), and 8) the extent of adjustment for potential confounders.
Also the extent of adjustment for confounders is very mixed with three studies failing to adjust for health status.
In order to attribute this difference to an earlier CIT, it needs a fair extent of adjustment of CIT in its marginal posterior distribution.
Practical advantage of the error-correction mechanism is that the extent of adjustment in a given period to deviations from long-run equilibrium is given by the estimated input output equation directly from neural network without any further calculation.
When studies had several adjustment models, we extracted those that reflected the maximum extent of adjustment for potentially confounding variables.
The extent of adjustment latitude at work should be taken into account as a possible risk factor.
These include variations in definition of smoking, definition of disease and extent of adjustment for confounders, and bias due to misclassification of smoking status.
We chose 8 degrees of freedom per year to be consistent with the extent of adjustment for temporal trends in recent multicity time-series analyses (e.g., Bell et al. 2009; Samoli et al. 2008).
