Encuesta de Fecundidad
Females who got married sometime, at least two children live birth.
Females married sometime, at least two children live birth    level of studies  duration of interval between 1st and 2nd birth.
Unidades: absolute figures

	Total	From 0 to 7 months	From 8 to 11 months	From 12 to 23 months	From 24 to 35 months	From 36 to 47 months	From 48 to 59 months	60 and over	Average	
Total	3.774.637	41.253	50.154	740.800	684.422	673.798	547.829	1.036.380	47,38	
Illiterate	17.438	..	1.073	4.928	4.967	3.944	1.990	538	32,74	
Without studies	153.458	..	3.479	50.041	34.677	27.117	20.916	17.228	36,34	
Primary education and second grade, GBE or first year of GCSE	2.317.355	18.063	33.584	423.436	389.447	409.219	353.452	690.154	48,98	
Secondary Education and Post-secondary non-higher	418.299	1.707	2.622	73.060	81.174	73.824	60.057	125.855	50,03	
1º, 2º and intermediate technical-professional studies	442.552	12.238	8.915	78.684	79.646	83.671	50.182	129.217	47,95	
Higher level technical-professional studies	2.872	..	..	573	..	2.299	..	..	31,85	
First year of tertiary education	199.460	7.800	..	42.934	46.164	34.945	32.327	35.292	41,11	
Tertiary education, university graduates and doctors	223.203	1.446	481	67.144	48.348	38.780	28.906	38.097	39,24	
Notas:
Fuente: National Statistics Institute