Table 3.

Average medication possession ratio (MPR) by demographic characteristics, 2002–2010.

Variable	N	Mean ± SD	p-value
Stratum-specific results
Urban
European American	867	0.957 ± 0.119	0.02
African American	239	0.934 ± 0.149
Rural
European American	233	0.962 ± 0.105	<0.01
African American	124	0.908 ± 0.165
Insurance Type 1
European American	892	0.965 ± 0.113	<0.01
African American	213	0.935 ± 0.145
Insurance Type 2
European American	208	0.929 ± 0.125	0.28
African American	150	0.911 ± 0.167