JOURNAL OF THE LOUISIANA STATE MEDICAL SOCIETY
4.6 ± 1.1 and 2.9 ± 0.9 respectively. There was a positive trend There was a positive trend for both whites and blacks over the study period (Cochran-Armitage chi-square test for trend = 41.44 (p = 0.000) and 32.34 (p = 0.000), respectively). When controlling for year, whites were found to have a much higher rate of hospitalization per 100,000 than blacks (Mantel-Haenszel chi-square: 117.904 (p = 0.000); Mantel-Haenszel risk ratio: 1.607, 95% CI: 1.47 – 1.75).
Rates by Race
Figure 4 shows the race distribution of GBS hospitalization rates per 100,000 population during the study period with respect to Louisiana’s two largest races by population, white and black. The white case count ranged from 49 -185 with a mean of 131.2 ± 14.5 and the black case count ranged from 21-77 with a mean of 42.56 ± 13.7. The mean rate of hospitalization per 100,000 was
Figure 4: Race Distribution of GBS Rate per 100,000 Population in Louisiana from 1999-2014.
(Jefferson Parish) with a mean of 51.6 and a median of 22.5. Case counts are useful to describe the burden of the disease, high case counts are observed in parishes with large population. Rates per 100,000 population showing incidence are more useful to identify areas of concern.
Rates by Parish
Figure 5 shows the distribution of cases across parishes in Louisiana between 1999 and 2014. The case count per parish ranged from 1 (East Carroll Parish and Tensas Parish) to 340
Figure 5: LAHIDD GBS Cases by Parish: Louisiana, 1999-2014
110 La State Med Soc VOL 170 JULY/AUG 2018
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