Further complications arise in identifying pregnancy-associated cancers from hospital data due to the inability to determine the duration of pregnancy in weeks of gestation, resulting in an imprecise pregnancy exposure period [ 8].
One limitation of the study is the imprecise definition of the hazard period and the eventual ED diagnosis.
These findings suggest that major roadway proximity during gestation and early life might have a greater influence on cognitive development than major roadway proximity later in childhood, but associations at both time periods were very imprecise due to small numbers of participants in the closest proximity group.
Self-reported exposure information reflecting usual behavior over a long time period may be too imprecise to measure incremental reductions in risk from longer durations of sun exposure.
Although these last semi-parametric estimates are imprecise, the drop in the 2007 period is significant at 5% and the general pattern of point estimates is broadly in line with our main results.
Although the AHS cohort is large, and 11,688 participants reported permethrin use, the small numbers of certain cancers occurring during the 9.14-year average follow-up period resulted in relatively imprecise risk estimates.
(I don't know when the pre-election started, it is one of those periods that are only marked by when they end, but their starting point is imprecise).
As for the future of penis size, Professor Hosken says it is hard to predict as measures of selection are imprecise and very difficult over long periods, and we don't know how genes will change over the long term.
Gestational age is rarely recorded and where recorded, tends to be based on self-reported last menstrual period (LMP), which is fairly imprecise.
Some existing measures are dictotomous in format or have long recall periods [14], thus potentially yielding imprecise information on change in the frequency and severity of nausea/vomiting due to therapy.
