Spss 17 package program

The χ² test or Fisher’s exact test was used to analyze and compare categorical variables between HBV-positive and HBV-negative pregnant women. Quantitative variables were compared by the Student’s t-test. Univariate and multivariate logistic regression analyses were performed to evaluate the risk factors associated with HBV infection among pregnant women. The data were analyzed by SPSS 17 package program (SPSS Inc., Chicago, IL, USA), and P values < 0.05 were defined as statistically significant.

SPSS 17 package program (SPSS Inc., Chicago, IL, USA) was used to perform all statistical analyses, and P values of less than 0.05 were defined statistically significant. Data were presented as frequencies, percentage and mean ± standard deviation (SD) following analysis by descriptive statistics. Quantitative data were compared between HEV seropositive and HEV seronegative pregnant women by Student's t-test. Chi-square test or Fisher’s exact test was used to compare and analyze categorical data. To evaluate the effect of variables on HEV seropositivity and to identify the risk factors of HEV infection in pregnant women, logistic regression analysis was used, and odds ratio (OR) with 95% confidence intervals (CI) was calculated.

SPSS 17 Package program (SPSS Inc., Chicago, USA) was used for statistical analysis, and p values below 0.05 indicated statistical significance. The data were analyzed and compared by the Mann-Whitney U test or independent t-test. All data were expressed as mean ± SD.