Tabla 4.

Association between difficulty chewing in women aged 20 to 59 years and independent variables. Florianopolis, SC, Southern Brazil, 2009. (N = 959)

Variable			Unadjusted analysis		Model 1a		Model 2b		Model 3c
			RC	95%CI	RC	95%CI	RC	95%CI	RC	95%CI
Demographic block
	Age (years)		p = 0.006		p = 0.002
		20 to 29	1		1
		30 to 39	1.5	0.8;2.8	1.6	0.8;2.9
		40 to 49	1.7	1.1;2.6	1.8	1.2;2.8
		50 to 59	2.1	1.2;3.5	2.1	1.3;3.6
	Cor da pele autorreferida		p = 0.084		p = 0.055
		White	1		1
		Parda /Black	1.5	0.9;2.3	1.6	(1.0;2.4)
Socioeconomic block
	Per capita income terciles (reais)		p = 0.001				p = 0.021
		3rd tercile (highest income)	1				1
		2nd tercile	1.5	0.9;2.4			1.5	0.9;2.8
		1st tercile (lowest income)	2.1	1.3;3.1			1.9	1.1;3.2
		Schooling in years of study	p = 0.001				p = 0.499
		≥ 12	1				1
		9 a 11	1.7	1.1;2.7			1.4	0.8;2.3
		5 a 8	1.8	1.1;2.8			1.2	0.7;2.0
		≤ 4	2.6	1.4;4.6			1.3	0.6;2.8
Use of dental services block
	Most recent dental visit (years)		p = 0.309						d
		< 1	1							–
		1 to 2	0.5	0.3;0.9						–
		3	1.0	0.5;2.1						–
Self-reported oral health conditions block
	Dry mouth		p = 0.012						p = 0.082
		Never/Sometimes	1						1
		Often/Always	2.2	1.2;3.9					1.8	0.9;3.3
	Wearing full dentures		p = 0.006						p = 0.192
		No	1						1
		Yes	2.0	1.2;3.3					0.5	0.2;1.3
	Number of natural teeth		p < 0.001						p = 0.005
		≥ 10 in both arches	1						1
		< 10 in at least one arch	2.6	1.7;3.9					2.2	1.1;4.3
		None	4.3	1.9;9.3					6.6	1.8;24.4
	Toothache		p < 0.001						p < 0.001
		No	1						1
		Yes	6.4	4.0;10.0					6.8	4.1;11.3
	Number of natural teeth x toothache								p < 0.001
									2.5	2.0;3.3

p < 0.20 and Multivariable Logistic Regression (odds ratio - 95%CI)

^aModel 1: block 1 variables adjusted for variables in the same block.

^bModel 2: block 2 variables adjusted for variables in the same block and for age.

^cModel 3: block 3 variables adjusted for variables in the same block and for age, income and schooling.

^dp > 0.20