Continuous variables are expressed as mean values ±
standard deviations. Categorical data are presented by
frequencies and percentage. For the comparison of the
measured angles of the vertebral bodies at three different
time points we performed a repeated measures analysis
of variance (ANOVA) with type of surgery (cage vs. autologous
graft) as grouping factor. Differences of VAS
and VAS spine score at follow-up, ODI and SF-36 items
between subgroups (defined above) were analyzed by
means of t-tests. As all statistical tests were conducted
solely in an explorative manner, no αlpha-adjustment for
multiple testing was carried out. Thus, p-values of p ≤
0.05 could be interpreted as statistically significant test
results with respect to the investigated collective of this
study.
Statistical analyses were carried out by the SAS statistical
analysis software package (SAS for Windows, Version
9.1; SAS Institute, Cary, NC, USA).
Continuous variables are expressed as mean values ±standard deviations. Categorical data are presented byfrequencies and percentage. For the comparison of themeasured angles of the vertebral bodies at three differenttime points we performed a repeated measures analysisof variance (ANOVA) with type of surgery (cage vs. autologousgraft) as grouping factor. Differences of VASand VAS spine score at follow-up, ODI and SF-36 itemsbetween subgroups (defined above) were analyzed bymeans of t-tests. As all statistical tests were conductedsolely in an explorative manner, no αlpha-adjustment formultiple testing was carried out. Thus, p-values of p ≤0.05 could be interpreted as statistically significant testresults with respect to the investigated collective of thisstudy.Statistical analyses were carried out by the SAS statisticalanalysis software package (SAS for Windows, Version9.1; SAS Institute, Cary, NC, USA).
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