Ascertainment of exact gestational age was a challenge in this study.
Mortality ascertainment was by "exact matches", i.e., sharing locality, demographic factors and period of care, with subject record between the SSA Death Master File database and our Texas tuberculosis file, using previously described methods [ 6].
Exact descriptions of the study population, case ascertainment, methodology pertaining to dietary and lifestyle data acquisition and microsatellite instability status assessment have been described in detail elsewhere [ 20].
As it is very difficult to know the exact reason(s) influencing a person/family to be referred and/or attend a genetics clinic, the correction for ascertainment is usually conservative, that is, by conditioning on the cancer status of all family members to avoid overestimation of any particular cancer risk that may have, in part, contributed to referral or attendance [ 68].
Although we believe that potential misclassification of CVD deaths and incomplete ascertainment of nonfatal cases was unlikely to have been differential by arsenic levels, we cannot predict the exact direction or extent of the potential bias with certainty.
Because of the complex ascertainment schemes of the six centers and the changes in ascertainment over three recruitment phases, we cannot define an exact population frequency for MLH1 epimutations for the whole population of all CRC patients.
Later, he added, "Open hearings are more conducive to the ascertainment of truth".
Prompt ascertainment is crucial for the management of hyperammonemic infants.
The narrator is demoted to the basement to "assist in the assembly and assessment" of ascertainment files.
Incomplete collection and ascertainment of variants demonstrates a need for a universally accessible system.
