Table 4.

Odds ratios for effects of education and place of residence interacted with cohort on the hazard of first intercourse for women, 2000 and 2005 Ethiopia demographic health surveys

Interactions models for predicting fist intercourse	First intercourse at time of marriage vs not started sexual activity	First intercourse before marriage vs not started sexual activity	First intercourse before marriage vs at time of marriage

	Odds ratio	Odds ratio	Odds ratio
	Interaction Model 1: Education × Cohort^a
Education (ref.=No formal education)	1.00	1.00	1.00
Primary	0.65^**	0.78^**	1.19
Secondary	0.37^**	0.64^**	1.72^**
Interactions
Primary × Cohort 1965-74	1.04	1.04	0.99
Primary × Cohort 1975-84	0.81^*	0.81^*	1.00
Secondary × Cohort 1965-74	0.62^**	0.80^**	1.31^*
Secondary × Cohort 1975-84	0.56^**	0.61^**	1.08
LR Chi-square = 13,176^**
	Interaction Model 2: Residence x Cohort
Place of residence (ref.=Rural)	1.00	1.00	1.00
Town	0.91	1.25^**	1.36
City	0.94	1.34^**	1.42^**
Interactions
Town × Cohort 1965-74	0.95	1.02	1.07
Town × Cohort 1975-84	0.94	0.90	0.96
City × Cohort 1965-74	0.83^*	1.04	1.25^*
City × Cohort 1975-84	0.75^**	0.79^**	1.03
Number of women = 24,817
Number of life years = 199,735
LR Chi-square = 13,118**

Notes:

Interaction models include all variables from main effects model in Table 3.

p <.05

^**

p <.01