Hospital episodes (inpatient admissions, day case, or outpatient attendances) were formed from serious adverse events with overlapping durations.
Concurrency measures that were more sensitive to overlap duration, however, showed large differences.
For analog signals comprised of several, possibly overlapping, finite duration pulses with unknown shapes and time positions, an efficient sub-Nyquist sampling systems is based on Gabor frames.
We report the mean and median overlap duration of all concurrent partnerships.
The difference between the cumulative and point prevalence measures is due to overlap duration.
The importance of overlap duration and coital exposure are examined here.
While this might seem like a complex empirical task, in fact only 9 questions are required to assess point prevalence and overlap duration.
Table 1 presents data on concurrency: summary statistics for the 3 prevalence measures, the overlap duration, and coital frequency in the three countries.
In the US, Blacks and, to a lesser extent, Hispanics reported higher prevalence, longer overlap duration and greater coital exposure with the less frequent partner than did Whites.
Point prevalence was a far better predictor of the epidemic trajectories we observed, because it captures overlap duration and, by implication, some element of coital frequency.
By contrast, the measures of concurrency that capture the impact of long term overlaps – point prevalence, overlap duration, and coital frequency – showed consistent differences across all of these populations that lined up with all of the observed HIV prevalence differentials.
