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Table 2 Univariate analysis of potential risk factors for preterm births in Taiwan, 2004–2013

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

Variables

Preterm (%) N = 5969

Full-term (%) N = 124,393

P-value

Parity

  

< 0.0001

 Multiparous

2767 (46.4)

61,371 (49.3)

 

 Nulliparous

3202 (53.6)

63,022 (50.7)

 

Multiplicity

  

< 0.0001

 Singleton

5595 (93.7)

123,797 (99.5)

 

 Multifetal births

374 (6.3)

596 (0.5)

 

Maternal age (years)

  

< 0.0001

 < 20

19 (0.3)

408 (0.3)

 

 20–39

4655 (78.0)

106,746 (85.8)

 

 ≥ 40

1295 (21.7)

17,239 (13.9)

 

History of preterm birth

  

< 0.0001

 No

5897 (98.8)

124,244 (99.9)

 

 Yes

72 (1.2)

149 (0.1)

 

History of maternal drug abuse/dependence

  

0.0002

 No

206

124,187

 

 Yes

24

5945

 

Maternal medical disorders

  

< 0.0001

 No

5050 (84.6)

118,169 (95.0)

 

 Yes

919 (15.4)

6224 (5.0)

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