Table 8.

Within study subgroup analyses

	Subgroup	Outcome measure	Analysis method	Conclusion
Crandall (2004)	‘Acute’ (<10 weeks old) versus chronic’ fractures (> 4 months old).	VAS pain post BKP ODI post BKP Kyphotic angle post BKP Vertebral height change	t test	= = = Acute > chronic
Garfin (2003/6)	Non recent (>60 days) versus recent (<60 days) fractures	Change in pain Change in Index of back function Change in SF-36 Change in satisfaction	ANOVA	=
Lane (2004)	Indication (osteoporosis vs. multiple myeloma)	Change in ODI Change in vertebral height (absolute) Change in vertebral height (%) Cement leakage	t test	= = Osteoporosis > multiple myeloma =
Majd (2005)	Age of fracture	Change in VAS pain Change in vertebral height	ANOVA	= =

ODI Oswestry disability index, ANOVA analysis of variance, =no statistically significant difference between subgroups, >subgroup A has statistically significant superior outcome than subgroup B