Increase in Preterm Birth during Demographic Transition in Chile from 1991 to 2012

Table 1

Evolution of single live births and maternal age by year. Chile, 1991–2012.

Birth year	Number of births	% 20–29	% < 35	% ≥ 35
1991	272574	56.9	89.4	10.6
1992	267356	55.8	89.0	11.0
1993	264541	54.9	88.6	11.4
1994	262969	54.3	88.5	11.5
1995	255581	53.1	87.9	12.1
1996	254635	52.2	87.4	12.6
1997	250274	51.1	86.9	13.1
1998	247509	50.2	86.6	13.4
1999	241036	49.5	86.0	14.0
2000	239370	48.8	85.4	14.6
2001	236807	48.0	84.8	15.2
2002	229835	48.0	84.5	15.5
2003	225555	47.5	84.0	16.0
2004	222297	46.9	83.9	16.1
2005	223173	46.7	84.0	16.0
2006	223213	46.3	84.0	16.0
2007	234527	46.9	84.3	15.7
2012	241175	47.3	84.3	15.7
2009	251744	48.2	84.0	16.0
2010	249735	47.8	83.6	16.5
2011	246885	47.9	83.3	16.7
2012	237735	47.6	83.4	16.6