A1C better reflects long-term glycemic exposure than current diagnostic tests based on point-in-time measures of fasting and postload blood glucose (4, 5) and has improved test-retest reliability (6).
The second analysis used estimates of serum PFOA as the exposure of interest, allowing us to use geocoded residences to estimate exposure metrics based on points in time or cumulative measures, but only for OH cases.
Our prediction model was based on one point in time measures, whereas Sterling and colleagues [ 3] accentuate the value of inclusion of time-changing variables for the study of prognostic factors.
Firstly, the estimates were based on a one point in time observation completed in the winter period.
5 16–18 However, in each case, this was based on a question asked at only one point in time.
Second, BMI as with physical activity was based on self-report and assessed at one point in time, which may have biased our results towards the null.
The differ from communities of memory in the sense that they are more 'real', they are typically based on face to face social interaction at one point in time and consequently tend to be restricted in size.[14] The family is the prototypical example.
We classified exposure based on blood lead levels measured at only one point in time.
The measures of SES are based on self-report and are captured at only one point in time.
In this study, exposure assessment was based solely on the place of residence at one point in time.
Our study is limited in that the comparison for each school grade is based on two points in time only, which are 6, 7, and 8 years apart for the first, eighth, and fourth graders, respectively.
