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Table 8 Uni- and multi-variate regression analysis of risk factors for perinatal mortality

From: Estimation of high risk pregnancy contributing to perinatal morbidity and mortality from a birth population-based regional survey in 2010 in China

A. Uni-variate regression analysis for perinatal mortality

Variables

Category

Mortality (%)*

OR

95% CI

P values

Gender

Male

0.4

1.154

0.898-1.481

0.262

 

Female

0.4

   

Multi-births

No

0.4

3.984

2.426-6.543

<0.001

 

Yes

1.5

   

Congenital anomalies

No

0.3

74.260

54.067-101.996

<0.001

 

Yes

19.2

   

Pregnancy complications

No

0.4

2.496

1.844-3.377

<0.001

 

Yes

0.9

   

Birthweight (grams)

≥2500

0.2

57.700

44.478-74.852

<0.001

 

<2500

8.8

   

Gestational age (weeks)

≥37

0.1

61.782

47.019-81.180

<0.001

 

<37

7.6

   

Maternal education (years)

≥10

0.2

1.888

1.247-2.860

0.002

 

<10

0.5

   

Maternal age (years)

<35

0.4

1.743

1.212-2.506

0.002

 

≥35

0.7

   

Amniotic contamination

No

0.2

8.374

6.454-10.864

<0.001

 

Yes

1.6

   

Amniotic fluid volume

Normal

0.3

4.894

3.661-6.542

<0.001

 

Abnormal

1.5

   

B. Multi-variate regression analysis for perinatal mortality

 

95% CI

Variables

Reference**

OR

Lower

Upper

P values

Gender

Male

1.240

0.896

1.715

0.194

Multi-births

No

2.396

1.196

4.799

0.014

Congenital anomalies

No

35.200

20.304

61.026

<0.001

Pregnancy complications

No

1.900

1.215

2.969

0.005

Birthweight (grams)

≥2500

5.397

3.458

8.442

<0.001

Gestational age (weeks)

≥37

32.305

20.463

50.998

<0.001

Education years

≥10

1.789

1.058

3.027

0.030

Maternal age (years)

<35

1.133

0.694

1.847

0.618

Amniotic contamination

No

10.995

7.824

15.452

<0.001

Amniotic fluid volume

Normal

2.354

1.583

3.502

<0.001

  1. *Mortality denotes those numbers of fetal deaths, stillbirths and early neonatal deaths in each category based on the total numbers of deaths listed in Table 1, 2, 3, 4, 5, 6 and 7.
  2. **As references of the opposite category of corresponding variables in this table part A.
  3. Abbreviations: OR odds ratio, CI confidence interval of OR.