Data analysis
Univariate comparisons between S. mansoni infection and
categorical variables were performed by a chi-square test with Yates’
correction or Fisher’s Exact test when appropriate, and continuous
variables were performed using Kruskal-Wallis’s test. The crude odds
ratio (OR) and 95% confidence interval (CI) was obtained as a measure
of the strength of association with and schistosomiasis. Adjusted OR was
obtained from multivariate logistic regression analysis. All
descriptive, univariate, and multivariate analyses were performed in Epi
Info 7.2.2.6 (https://www.cdc.gov/epiinfo/index.html). We also
performed Student’s t test to evaluate differences between Dics from
immigrants and natives and Mann-Whitney to assess differences between
Dics for percent of lifetime spent in Salvador.