Among 169 operation (53.3 % vertebroplasty, 46.7 % kyphoplasty) and 121 comparison patients, there is no significant statistical difference of new OVCFs incidence between the two groups calculated by patient proportion.
Significance between groups was calculated by using two-tailed student's t-test and Wilcoxon matched paired test using Prism Pad software (version V), with p < 0.05 considered significant.
For the pain dataset, overall statistical significance was calculated using Friedman's test (nonparametric paired ANOVA), while differences between groups was calculated by Wilcoxon matched pairs test.
For the pH data, overall statistical significance was calculated using Kruskal Wallis test (nonparametric unpaired ANOVA), while differences between groups was calculated by Mann Whitney test.
Differences between groups were calculated by Mann-Whitney U test.
Difference between groups were calculated by one-way ANOVA analysis.
Statistical comparisons of data between groups were calculated by Student's 2-tailed t-test.
Statistical differences between groups were calculated by Student's two-tailed t test.
Significant differences between groups were calculated by the Mann-Whitney test (Software GraphPad Prism 5) because the distribution of the data was not Gaussian.
Frequencies between groups were calculated by Fisher's exact test.
