Table 4. Factors associated with prescription of potentially inappropriate medications, according to Beers criteria 2003 (São Paulo, 2008).

Characteristic	P value	Odds ratio	95% confidence interval
Female sex	0.018	1.5	1.1-2.2
Age
70-79 years	0.031	0.59	0.37-0.91
³ 80	0.024	0.59	0.37-0.91
Medications
1 to 4	0.065	----	----
5 to 6	0.065	----	----
7 to 9	< 0.001	4.5	2.7-7.5
³ 10	< 0.001	9.2	5.5-15.3