JOURNAL OF THE LOUISIANA STATE MEDICAL SOCIETY
rate difference between the ≥45 age groups and the <35 age groups. Lastly, only the 35-44, 45-54, and 55-64 age groups show a significant increasing trend in annual hospitalization
rates over the study period (Cochran- Armitage chi-square test for trend = 8.08 (p = 0.004), 20.12 (p = 0.000), and 27.96 (p = 0.000), respectively).
James Diaz, MD
Figure 2: Rates per 100,000 Population by Age Group in Louisiana from 1999-2014
Rates by Sex
significant positive or negative trend for male cases over the study period (Cochran-Armitage chi-square test for trend = 3.31 (p = 0.069), but there was a positive trend for female cases over the study period (Cochran-Armitage chi-square test for trend = 14.49 (p = 0.000). When controlling for year, males and females were found to have no difference in rate of hospitalization across the study period (Mantel-Haenszel chi-square: 3.405 (p = 0.065); Mantel-Haenszel risk ratio: 1.065, 95% CI: 1.00 – 1.14).
Figure 3 shows the sex distribution of GBS hospitalization rates per 100,000 population during the study period. The male case count ranged from 70-133 with a mean of 105.7 ± 14.5 while thefemale case count ranged from 62-131 with a mean of 106.1 ± 19.3. The mean rate of hospitalization per 100,000 was 4.9 ± 0.6 and 4.6 ± 0.8, respectively. There was not a statistically
Figure 3: Sex Distribution of GBS Rates per 100,000 Population in Louisiana from 1999-2014.
J La State Med Soc VOL 170 JULY/AUG 2018 109
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