Table 3.

Results of meta-analysis of perioperative outcome measures

Outcomes or subgroups	No. of studies	No. of patients	Statistical method	Effect estimate (95% CT)†	P value
(1) Volume of cement	6	615	WMD	−0.75 [−0.93, −0.57]	<.05*
(2) Operative time	2	188	WMD	−3.44 [–4.94, −1.94]	<.05*

WMD, indicated weighted mean difference; CI, confidence interval.

If effect estimate is positive (> 0), it means vertebroplasty group is more than kyphoplasty group. If it is negative (< 0), it means vertebroplasty group is less than kyphoplasty group. Whether it is significant lies on the P value.

^*Statistically significant.

^†Effect estimate.