Table 3

Subgroup analysis for hip 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	1.79 (1.56 to 2.05)	<0.001	97.5	<0.001	1.04 (0.81–1.34)	0.759
Country	Eastern	1.72 (1.39 to 2.14)	<0.001	89.5	<0.001	1.04 (0.81–1.34)	0.759
DM types	I	4.35 (2.91 to 6.49)	<0.001	95.4	<0.001	3.43 (2.27–5.17)	<0.001
DM types	II	1.27 (1.16 to 1.39)	<0.001	85.5	<0.001	3.43 (2.27–5.17)	<0.001
Sex	Men	2.05 (1.68 to 2.51)	<0.001	97.0	<0.001	1.00 (0.78–1.29)	0.969
Sex	Women	2.04 (1.76 to 2.37)	<0.001	97.5	<0.001	1.00 (0.78–1.29)	0.969
Study design	Prospective	2.02 (1.71 to 2.39)	<0.001	91.4	<0.001	1.09 (0.87–1.36)	0.472
Study design	Retrospective	1.86 (1.60 to 2.16)	<0.001	98.7	<0.001	1.09 (0.87–1.36)	0.472