This exclusion and misclassification may have underestimated the effects observed in this study.
Although we used a validated "recognition-based" headache diagnostic method in our study, misclassification may have had an impact on the supplementary analyses.
For a variety of inference problems including marker-treatment interaction in particular, we show that marker misclassification may have profound adverse effects on the coverage of confidence intervals, power of the tests, and required sample sizes.
Hence, misclassification may have led to conservative estimates.
Furthermore, a certain degree of misclassification may have occurred as a result and there is considerable residual heterogeneity beyond what the etiologic grouping can explain.
These results indicate that place of residence during the Hunger Winter is a reasonably adequate proxy of exposure, although unavoidable misclassification may have caused attenuation of the association.
Some misclassification may have occurred as the nutritional situation of Biafra gradually deteriorated, making it difficult to pinpoint the start of famine.
Random misclassification may have happened if the misclassification of mental disorders occurred to the same degree among those with and without hypertension diagnosis.
Such misclassification may have biased the results.
As such, misclassification may have occurred in our cohort.
Measurement error and misclassification may have biased our results.
