Table 1

Common characteristics about the included data sets

References	Country	Published year	Study design	Research center	Number of patients			Age

					V	K	Total	V	K
Liu et al.¹⁸	Chinese Taiwan	2010	RCT	1	50	50	100	74.3	72.3
Kumar et al.¹⁹	Canada	2010	NRCT	1	28	24	52	78	73
Santiago et al.²⁰	Spain	2010	PC	1	30	30	60	73.0	65.9
Yan et al.²¹	China	2010	RC	1	94	98	192	77.2	76.9
Hiwatashi et al.²²	Japan	2008	RC	1	66	40	106	77	75
Schofer et al.²³	Germany	2009	PC	1	30	30	60	72.5	73.8
Lovi et al.²⁴	Italy	2009	NRCT	1	118	36	154	67.6	67.6
Zhou et al.²⁵	China	2008	RC	1	56	32	88	62	64
Frankel et al.²⁶	USA	2007	RC	1	19	17	36	72	70
De Negri et al.²⁷	Italy	2007	NRCT	1	10	11	21	NR	NR
Grohs et al.²⁸	Austria	2005	NRCT	1	23	28	51	70	70
Pflugmacher et al.²⁹	Germany	2005	PC	1	20	22	42	72.3	71.2
Movrin et al.³⁰	Slovenia	2010	NRCT	1	27	46	73	72.9	67.8
Röllinghoff et al.³¹	Germany	2008	PC	1	45	45	90	NR	NR
Pilát et al.³²	Italy	2007	RC	1	11	15	26	NR	NR

RCT, randomized controlled clinical trial; NRCT, nonrandomized controlled clinical trial; PC, prospective cohort study; RC, retrospective cohort study; V, vertebroplasty group; K, kyphoplasty group; NR, not reported or could not get.