Table 3. Crude and adjusted prevalence ratios or the use of at least one drug by self-medication, according to demographic, socioeconomic aspects, health conditions indicators and access to health services indicators. PNAUM, Brazil, 2014. (N = 40,833).

Variable	Crude PR	95%CI	p	Adjusted PR	95%CI	p
Gender			< 0.001			< 0.001
Male	1			1
Female	1.44	1.31–1.59		1.33	1.21–1.47
Age group (years)			< 0.001			< 0.001
0-9	1			1
10-19	1.89	1.54–2.33		2.03	1.66–2.47
20-39	3.25	2.72–3.89		3.46	2.94–4.08
40-59	2.68	2.22–3.21		2.68	2.26–3.17
≥ 60	2.15	1.78–2.59		1.95	1.63–2.34
Color			< 0.001			0.045
White	1			1
Black	1.19	1.04–1.37		0.93	0.81–1.07
Yellow	1.63	1.25–2.13		1.11	0.88–1.40
Brown	1.11	1.00–1.23		0.90	0.82–1.00
Indigenous	1.93	1.18–3.16		1.37	0.89–2.12
Education (years)			< 0.001
0-8	1
9-11	1.37	1.17–1.43
≥ 12	1.37	1.15–1.52
Economic classification*			0.858
D/E	1
A/B	1.03	0.90–1.20
C	1.03	0.93–1.13
Region			< 0.001			0.001
North	1.56	1.27–1.92		1.76	1.44–2.16
Northeast	2.10	1.79–2.44		2.33	2.00–2.72
Southeast	1.12	0.92–1.36		1.18	0.97–1.42
South	1			1
Midwest	1.18	1.44–1.98		1.74	1.49–2.04
No. chronic diseases			< 0.001			< 0.001
0	1			1
1	1.33	1.20–1.48		1.17	1.06–1.29
≥ 2	1.33	1.20–1.47		1.33	1.18–1.50
Health insurance			0.708
No	1
Yes	1.03	0.90–1.18
Hospitalized in the previous year			< 0.001
No	1
Yes	1.29	1.14–1.47

* According to the 2013 Brazilian Economic Classification Criterion of the Brazilian Association of Research Companies (www.abep.org).