Spss 14.0 statistical software

All data are expressed as means ± standard deviation. Data were analyzed by one-way analysis of variance (ANOVA) followed by post hoc Fisher's least significant difference test. The relation among rotation and twist with LVEDP, LEVSP, LA, LVEDV, LVESV, LVEF, MAPSE, TAPSE, QRS duration, TPT and RSI was assessed with Pearson correlation analysis. Inter-observer variability of measurements was determined by two independent blinded observers on 25 randomly selected cases for twist and TPT measurements.
Analyses were performed using the SPSS 14.0 statistical software (SPSS, Chicago, IL, USA). All statistical tests were two sided, and a P value <0.05 was considered to indicate statistical significance.

Using SPSS 14.0 statistical software (SPSS Inc., Chicago, USA), the data was tested for normality using the Kolmogorov-Smirnov test. Both the data for length of stay and time to operation were normally distributed. The t-test was therefore used to assess any statistically significant difference between the two groups. The significance level was chosen at 0.05. The two-tailed Z-test for comparing two population proportions was used for comparing the data for 30-day mortality. This was also used for the data on patients discharged home.

A research nurse entered all baseline and outcome data in the study database. Data were collected on handwritten forms and archived in a password-protected, electronic database. All continuous variables are presented as the mean ± standard deviation. SPSS 14.0 statistical software (SPSS, Inc., Chicago, USA) was used for the statistical analyses. Independent two-sample t-tests and Spearman correlations were used to assess categorical data. Fisher's exact t-test was used to compare categorical data between two groups, and the Mann-Whitney U test was used to compare ordinal or continuous variables between groups. A value of P < 0.05 was considered statistically significant. In our pilot study, 15% of the patients in the controlled decompression surgery group died, compared with 30% in the rapid decompression group. On the basis of these data, we estimated that 118 patients would be needed to confirm this effect with an α of 5 and 80% power. To allow the reliable detection of a slightly smaller effect and account for a 5% loss to follow-up rate, we decided to enroll 248 patients.

In this study, at least three separate repetitions of each experiment were performed. Unless otherwise specified, the data are presented as mean ± standard deviation. Statistical analyses were performed using SPSS 14.0 statistical software (SPSS, Chicago, IL). One-way analysis of variance and the Bonferroni t-test for multigroup comparisons were used to calculate the P values. P < 0.05 was considered statistically significant.

All values are reported as mean ± standard deviation (SD) unless otherwise stated. All statistical analysis was performed using SPSS 14.0 statistical software. The significant differences between the groups were analyzed by a Student’s t test. Comparisons among multiple groups were analyzed by one-way analysis of variance (ANOVA). Data were considered statistically to be significant at p < .05.