Weaknesses include the different assessment tools used to measure childhood cognitive ability in each cohort which raises questions of comparability of results between cohorts.
Looking at the question of pay comparability more generally, DiSalvo has a largely fair discussion of the literature on the topic.
The timing difference for the non-invasive study (5 weeks) and the invasive study (14 weeks) during the course of rhEpo administration (see Fig. 1) raises the question of the comparability of the two studies, because of a potential rhEpo time effect.
The NOS assigns a maximum of four questions for selection of study groups, two questions for comparability of study groups, and three questions for ascertainment of the outcome of interest.
The 2004 scannable format meant modifications to questions, with loss of comparability with questions in the 1999 survey.
The base case analysis of a network meta-analysis includes the broadest available evidence base corresponding to the question evaluated, under the condition of comparability for effect modifiers' characteristics.
These questions were chosen over some PRAMS Phase 6 questions for comparability.
Finally, in the era of big data, the integration of multiple types of heterogeneous data is itself an important problem, the method we used in this paper provides a means for solving two basic questions, the comparability of heterogeneous data and the integration of multiple types of data.
These included a lack of publicly available toxicogenomics databases, a lack of validation of available technologies, questions concerning the comparability of different technical platforms and how transcription products relate to toxicity, and uncertain regulatory applications.
