Table 2.

Factors associated with hypertension in rural and urban areas in the Golestan Cohort Study

	Rural areas OR (95% CI)	Urban areas OR (95% CI)
Gender
Male	1	1
Female	1.17 (1.10,1.24)	0.94 (0.83,1.05)
Age
Below 50	1	1
50–60 years	2.14 (2.04,2.25)	2.49 (2.26,2.75)
Above 60	4.13 (3.87,4.40)	4.87 (4.33,5.49)
BMI
Underweight	0.59 (0.53,0.66)	0.57 (0.42,0.78)
Normal	1	1
Overweight	1.89 (1.79,1.99)	1.73 (1.55,1.93)
Obese	3.05 (2.88,3.24)	2.93 (2.61,3.30)
Literacy
Illiterate	1	1
Literate	0.88 (0.83,0.94)	0.77 (0.69,0.85)
Ethnicity
Turkmen	1	1
Non-Turkmen	0.90 (0.86,0.95)	1.00 (0.92,1.01)
Physical activity
No	1	1
Yes	0.79 (0.73,0.85)	0.97 (0.80,1.17)
Smoking
Never	1	1
Light smoker	0.75 (0.67,0.84)	0.73 (0.58,0.93)
Heavy smoker	0.80 (0.72,0.88)	0.76 (0.63,0.91)
Ex-smoker	0.90 (0.82,0.99)	0.96 (0.80,1.15)
Others	0.88 (0.79,0.98)	1.00 (0.76,1.32)
Black tea
Q1 (<690 ml)	1	1
Q2 (691–1035 ml)	0.92 (0.86,0.97)	0.95 (0.84,1.06)
Q3 (1036–1500 ml)	0.91 (0.86,0.96)	0.86 (0.77,0.96)
Q4 (> 1500 ml)	0.86 (0.81,0.92)	0.87 (0.77,0.98)
Green tea
Non drinker	1	1
drinker	0.99 (0.97,1.01)	1.04 (1.00,1.09)
Wealth score
1 unit increase	0.86 (0.76,0.97)	0.54 (0.44,0.67)