Table 2. Prevalence of abdominal aortic aneurysm in older people by different stratified factors.

Stratified factors	No. of Studies	Prevalence rate	Lower limit	Upper limit	Heterogeneity I 2 (%)	P from test of heterogeneity	Model
Total	56	0.048	0.043	0.053	99.4	0.000	REM
Area
America	12	0.043	0.033	0.053	99.8	0.000	REM
Europe	37	0.051	0.044	0.059	98.9	0.000	REM
1988–1992	3	0.065	0.048	0.081	31.8	0.231	REM
1993–1995	6	0.065	0.036	0.094	98.3	0.000	REM
1996–1998	4	0.042	0.035	0.049	94.1	0.000	REM
1999–2001	9	0.053	0.034	0.073	99.1	0.000	REM
2002–2004	3	0.045	0.026	0.063	96.0	0.000	REM
2005–2007	2	0.047	0.032	0.062	66.4	0.085	REM
2008–2010	5	0.046	0.037	0.055	95.5	0.000	REM
2011–2013	5	0.028	0.014	0.043	99.3	0.000	REM
Australia	4	0.067	0.065	0.070	96.5	0.000	REM
Asia	3	0.005	0.003	0.007	94.6	0.000	REM
Gender
Male	49	0.060	0.053	0.067	99.3	0.000	REM
Female	23	0.016	0.012	0.019	95.8	0.000	REM
Age (y)
55–64	3	0.013	0.012	0.015	89.5	0.000	REM
65–74	9	0.028	0.027	0.029	97.7	0.000	REM
75–84	7	0.012	0.011	0.013	99.0	0.000	REM
≥85	2	0.006	0.004	0.007	83.2	0.000	REM
Aneurysm diameters (mm)
30–39	11	0.033	0.028	0.039	98.3	0.000	REM
40–49	5	0.007	0.004	0.010	97.3	0.000	REM
≥50	9	0.004	0.003	0.005	90.3	0.000	REM

Abbreviation: AAA, asymptomatic abdominal aneurysm; No., number; REM, random effects model.