Table 3. Crude odds ratio for behavior change stages according to demographic and economic factors.

Variables	Action	Preparation	Contemplation	Pre-contemplation
	Crude OR (95%CI)	Crude OR (95%CI)	Crude OR (95%CI)	Crude OR (95%CI)
Gender
Male	1	1	1	1
Female	2.00 (1.64-2.43)	3.47 (2.85-4.23)	3.01 (2.41-3.76)	2.56 (1.93-3.40)
Age
16-17 years	1	1	1	1
18-19 years	0.73 (0.61-0.87)	0.84 (0.70-1.01)	1.08 (0.09-1.29)	0.87 (0.68-1.12)
Area of residence
Rural	1	1	1	1
Urban	1.26 (0.96-1.66)	1.01 (0.81-1.27)	1.11 (0.83-1.49)	1.00 (0.76-1.34)
Employment situation
Works	1	1	1	1
Does not work	1.34 (1.16-1.55)	1.70 (1.35-2.14)	1.84 (1.55-2.19)	2.22 (1.79-2.77)
Family income a
Up to two	1	1	1	1
Three to five	0.92 (0.72-1.17)	0.83 (0.64-1.08)	1.10 (0.87-1.38)	0.73 (0.56-0.96)
Six or more	0.70 (0.52-0.94)	0.52 (0.41-0.68)	0.88 (0.68-1.14)	0.61 (0.42-0.89)
Maternal level of schooling
Elementary school	1	1	1	1
High school	1.03 (0.87-1.23)	0.85 (0.69-1.05)	1.04 (0.82-1.32)	0.93 (0.72-1.19)
College/university	0.85 (0.67-1.07)	0.82 (0.59-1.16)	0.73 (0.54-1.00)	0.91 (0.69-1.20)
School grade
10th	1	1	1	1
11th	0.96 (0.76-1.22)	1.04 (0.86-1.26)	1.31 (0.94-1.81)	0.81 (0.59-1.11)
12th	0.74 (0.59-0.93)	1.02 (0.84-1.24)	1.81 (1.42-2.29)	0,.79 (0.59-1.06)
School shift
Morning	1	1	1	1
Evening	0.88 (0.72-1.08)	0.88 (0.71-1.07)	0.81 (0.67-0.98)	0.85 (0.65-1.12)

CI, confidence interval; OR, Odds ratio.

^aMinimum wages.