Table 2.

Factors independently associated with spotted fever group Rickettsiae (SFGR) seropositivity in multivariate analysis, Reunion island, 2009 (n = 241)

Rickettsia rickettsii IgG ≥ 1:64
Variables	n	%	Adjusted PPR	95% CI
Age
< 20 years	0/24	0.00	NA**
20–39 years	13/77	18.84	1	–
40–59 years	23/102	21.88	1.22	0.55–2.69
≥ 60 years	9/38	21.91	1.20	0.46–3.15
Gender
Female	25/136	17.92	1.05	0.61–1.82
Male	20/105	16.61	1
Microregion
North	2/17	14.63	1.62	0.30–8.72
South	6/80	5.73	1	–
West	26/78	30.07	3.61*	1.32–9.87
East	11/66	17.01	2.10	0.68–6.42

Data are numbers (n), weighted seropositive rates (%), adjusted prevalence proportion ratios (PPR), and 95% confidence intervals (95% CI)

NA not assessed

P values linked to variable names are given for overall design-based Pearson chi2 tests

P values linked to PPR are given for within-each-category Wald tests

* P < 0.05

** P < 0.01