Table 1.

Characteristics of the analytical sample by place of residence in 14176 Iranian women, 1999–2000

Variables	Rural (n = 5219)	Urban (n = 8957)
Age, years(mean, sda)	36.91 (13.58)	37.3(13.6)
BMIb(mean, sd)	24.14(4.64)	26.02(5.06)
Years of education(mean, sd)	2.59(3.42)	5.65(4.83)
Married (number)	3973	7234
Non-married (number)	1246	1723
Low economic index(number)	1655	2379
Lower-middle economic index(number)	1036	2271
Upper-middle economic index(number)	1280	2212
High economic index(number)	1248	2095
Smoker (number)	97	176
Non smoker(number)	5122	8781

^astandard deviation

^bBody mass index (weight (kg)/height(m)²).