Spss v 21.0 statistical software for windows 7

Categorical data were compared using the χ² test or Fisher's exact test, as appropriate. Continuous data were compared using the Student's t test and expressed as mean (SD). Regarding the sample size estimation, we hypothesised that there would be approximately a 6% difference in the eradication rates between the two studied regimens.8 (link) Knowing that the eradication rate of T-14 was approximately 85%,8 (link)
21 (link) our original sample size estimation was at least 500 for each group, given a power of 80% and a 0.05 two-side type 1 error, assuming a 10% loss to follow-up. Following an interim report, we decided to increase the sample size to a conservative estimate of 650 for each group, hoping to reach a power of 90% in the rejection of the null hypothesis. Multiple logistic regression analysis was performed to identify predictors of treatment failure. All p values were two-tailed, with the level of statistical significance set at 0.05. The statistical analyses were performed using the SPSS V.21.0 statistical software for Windows 7 (IBM, Armonk, New York, USA). All authors had access to the study data, and had reviewed and approved the final manuscript.

Unless otherwise indicated, values were expressed as mean ± standard deviation (SD). Student's t test was used to compare the mean values of continuous variables. Categorical data were compared using the χ2 test or Fisher's exact test, as appropriate. All P values were two‐tailed, with the level of statistical significance set at 0.05. The data were summarized by the primary measures of central tendency and dispersion, as well as by frequencies and percentages with 95% CI. The statistical analyses were performed using the SPSS V.21.0 statistical software for Windows 7 (IBM, Armonk, New York, USA). All authors had access to the study data and reviewed and approved the final manuscript.