. 2010 Jan-Apr;7(1):39–44.

Table II.

- VAS during the follow-up period and according to the number of the treated vertebrae.

	Pre-PVP*	1 month*	6 months*
1 vertebra^†	8.6 (7.2-9.6)	1.3 (0.0-2.1)	1.2 (0.3-2.1)
2 vertebrae^†	8.9 (7.0-9.3)	0.8 (0.0-1.9)	1.8 (0.0-3.4)
> 2 vertebrae^†	8.1 (7.4-9.4)	0.8 (0.0-3.0)	2.0 (0.6-3.8)
General-VAS^‡	8.7 (7.3-9.5)	1.1 (0.0-2.6)	1.5 (0.3-3.0)

*No statistically significant difference has been observed between groups (number of treated vertebrae) during every step of the follow-up period (pre-PVP, 1 month and 6 months: Kruskal-Wallis test, p-values NS)

† Statistically significant differences has been observed between pre-PVP and all the other follow-up periods (for each group of treated vertebrae: Mann-Whitney test, all p-values <0.001), but no statistically significant differences has been observed between the post operative follow-up periods (Kruskal-Wallis test, pvalues NS)

‡ Statistically significant differences has been observed for the General-VAS between pre-PVP and all the other follow-up periods (Mann-Whitney test, p<0.001), but no statistically significant differences has been observed between the post operative follow-up periods (Kruskal-Wallis test, p=.0.8)