By assuming (conservatively) that the risk of infection experienced by Mexicans is at least equal to that experienced by visitors, and using travel data to assess the amount of person-time at risk for visitors, we estimate the incidence rate in proportion to the Mexican population, and estimate a lower-bound of how many cases may have been present in Mexico at a defined time.
On the other hand, the non-GBM incidence rate increased in proportion to approximately the square root of age, an age-incidence pattern that is quite unusual [ 23].
The GBM incidence rate increased in proportion to approximately the 4th power of age, similar to what was found in an analysis of SEER data among Whites in 1973-1982 [ 22].
Smoking also increases the frequency of mtDNA deletions in lung tissues, and the incidence and proportion in current smokers were significantly higher than in those of non-smokers (10).
Nevertheless, our results are worthwhile in evaluating the differences in incidence and proportion of diseases between Asia and the US, and in providing clues toward an understanding of aetiology.
Change in incidence proportion was obtained by comparing age-matched cohorts 15 years apart.
Changes in the serotype epidemiology of invasive pneumococcal disease (IPD) and pneumococcal pneumonia have been reported in recent years, with significant declines in incidence and in the proportion of disease caused by PCV7 serotypes and increases in the proportion of non-PCV7 serotype disease [ 22– 27].
The minor difference in proportion between incidence and prevalence suggests that most of the patients with a sport-related injury consult the GP only once for a particular problem.
The incidence of non-melanoma skin cancer (NMSC) shows a marked geographical variation (Diepgen and Mahler, 2002), with incidence rapidly increasing in white populations in proportion to proximity to the equator; in particular, incidence of SCC doubles for each 8- to 10-degree decline in latitude (Giles et al, 1988).
Attributable risk was defined as the incidence proportion in the exposed group minus the incidence proportion in the UNX group, which was adjusted for differences in the distribution of covariates between groups.
