The epidemiologic characteristics and associated risk factors of preterm birth from 2004 to 2013 in Taiwan

Table 1 Demographic characteristics of live births enrolled in the study according to maternal obstetric characteristics in Taiwan, 2004–2013

Variables	Number N = 130,362	%
Status of delivery
Full term	124,393	95.4
Preterm	5969	4.6
Spontaneous preterm birth	5010
Provider-initiated preterm birth	959
Parity
Nulliparous	66,224	50.8
Multiparous	64,138	49.2
Gestational age (weeks)
20–27	130	0.1
28–31	262	0.2
32–36	5577	4.3
≥ 37	124,393	95.4
Maternal age (years)
< 20	427	0.3
20–39	111,401	85.5
≥ 40	18,534	14.2
Multiplicity
Singleton birth	129,392	99.3
Full term	123,797
Preterm	5595
Multifetal births	970	0.7
Full term	596
Preterm	374
History of preterm birth	221	0.2
History of maternal drug abuse/dependence	230	0.2
Maternal medical disorders	7143	0.5

ISSN: 1471-2393