. 2019 Jan 3;9(1):e024067. doi: 10.1136/bmjopen-2018-024067

Table 7.

Subgroup analysis for vertebrae fracture based on country, DM types, sex and study design

Factors	Subsets	RR and 95% CI	P value	I² (%)	P value for heterogeneity	Ratio of RR between subgroups	P value for ratios of RR
Country	Western	1.74 (0.82 to 3.69)	0.148	96.5	<0.001	1.93 (0.79–4.71)	0.146
Country	Eastern	0.90 (0.56 to 1.45)	0.664	–	–	1.93 (0.79–4.71)	0.146
DM types	I	–	–	–	–	–	–
DM types	II	1.74 (0.96 to 3.16)	0.070	96.7	<0.001	–	–
Sex	Men	2.26 (0.40 to 12.73)	0.354	88.9	0.003	1.42 (0.23–8.85)	0.706
Sex	Women	1.59 (0.88 to 2.87)	0.125	84.1	<0.001	1.42 (0.23–8.85)	0.706
Study design	Prospective	1.36 (0.88 to 2.11)	0.167	66.4	0.018	0.54 (0.25–1.14)	0.105
Study design	Retrospective	2.54 (1.37 to 4.70)	0.003	96.1	<0.001	0.54 (0.25–1.14)	0.105

DM, diabetes mellitus; RR, relative risk.