We used a χ test to determine if there was a significant difference of at least P <.05 among the case definition and the method of ascertainment for each characteristic.
In observational study contexts, on the other hand, they are the result of the method of ascertainment, which can lead to partial distortion of the observations.
Cases were excluded from analyses by method of ascertainment in instances where the method of ascertainment was not recorded.
These observed differences could be due to the method of ascertainment.
There were two sets of control subjects who were differentiated based on the method of ascertainment.
The method for incident delirium ascertainment has been described.
The methods for case ascertainment significantly impact incidence estimates.
This paper presents the rationale for the study, describes its context, and the methods for twin ascertainment and data collection.
The findings of the FoodNet HUS surveillance system were affected by key characteristics of the surveillance system, including the methods for case ascertainment and classification.
Diverse patterns of inheritance have been reported for non-syndromic cases of RP and their families depending on the geographical origin, the sample size of the study and the methods for clinical ascertainment.
The methods of ascertainment were as described previously (Hawkins et al, 1992).
