Encuesta de Fecundidad
Characteristics marriages / couples and exposure to pregnancy risk. Women  15-49 years
Average duration 1st relation, single females with some relation,level of studies and age actual (years).
Unidades: Average duration (years)

	Total	From 15 to 19 years old	From 20 to 24 years old	From 25 to 29 years old	From 30 to 34 years old	From 35 to 39 years old	From 40 to 44 years old	From 45 to 49 years old	
Total	0,9	0,1	0,2	0,9	2,4	5,4	3,6	3	
Illiterate	8,1	..	4	6,7	13	11	20	0	
Without studies	5,9	4	..	0	15	6,7	0	0	
Primary education and second grade, GBE or first year of GCSE	1,5	0,2	0,5	1,5	3,1	8,3	4,2	5,1	
Secondary Education and Post-secondary non-higher	0,5	0	0,1	0,6	2,3	6,3	2,6	0	
1º, 2º and intermediate technical-professional studies	0,6	0,1	0,1	1	2,3	1,9	7,6	0	
Higher level technical-professional studies	0,9	0	0,2	1,5	2	0	0	0	
First year of tertiary education	0,8	0	0	0,8	1,5	0	2,4	6,1	
Tertiary education, university graduates and doctors	0,5	..	0	0,1	1,7	2	1,9	0,6	
Notas:
Fuente: National Statistics Institute