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Table 1 Demographics, unadjusted odds ratios, and excluded records, New Mexico 1991-2005

From: An exploratory study of the variables impacting preterm birth rates in New Mexico

No. of records total 1990-2005: 451742

Minimum no. in a year (1997): 27484

Maximum no. in a year (2005): 29456

Frequency

% of total

% Preterm after Exclusions

Unadjusted Odds Ratio

Ethnicity

    

Asian

5889

1.3

8.66

0.97

Other

254

0.06

12.7

1.49

White Hispanic

219893

48.68

9.26

1.049

Native American

63115

13.97

7.77

0.869

Black

8378

1.85

12.7

1.49

White Non-Hispanic

154213

34.14

8.92

Reference

Missing

26673

5.9

20

6

Inadequate

107576

23.81

8.66

2.28

Intermediate

80289

17.77

3.63

0.90

Adequate

139993

30.99

4

Reference

Intensive

97211

21.52

18.01

5.27

Maternal Age

< 15

1446

0.32

14.43

1.90

15-19

75920

16.81

9.76

1.22

20-24

135445

29.98

8.63

1.06

25-29

114764

25.4

8.16

Reference

30-34

79154

17.52

8.91

1.10

35-39

36438

8.07

10.46

1.31

> = 40

8307

1.84

12.4

1.59

Missing

268

0.06

  

Maternal Education Level (# of years)

< 9

27216

6.02

8.75

0.96

9-12

259107

57.36

9.11

Reference

13-16

120997

26.78

8.33

0.91

> 16

30040

6.65

8.26

0.90

Missing

14382

3.18

  

Facility

    

hospital

445529

98.62

9.05

Reference

birth center

1192

0.26

1.68

0.17

home

4131

0.91

4.58

0.48

other

890

0.2

12.97

1.50

Maternal Marital Status

    

Missing

4

0

  

Married/inferred married

253396

56.09

8.42

Reference

Unmarried/inferred unmarried

198342

43.91

9.72

1.17

Maternal Tobacco Use

    

No

399904

88.52

8.5

Reference

Yes

45737

10.12

11.84

1.45

Missing

6101

1.35

20.49

2.77

Maternal Alcohol Use

    

No

435079

96.31

8.71

Reference

Yes

9540

2.11

13.02

1.57

Missing

7123

1.58

20.84

2.76

No

376322

83.30

7.25

Reference

Yes

75420

16.7

17.69

2.75

Individual high risk factors*

Lung

7158

1.58

  

Cardiac

1996

0.44

  

Diabetes

15686

3.47

  

Eclampsia

3881

0.86

  

Hydramnios/oligohydramnios

7477

1.66

  

Chronic hypertension

3634

0.8

  

Pregnancy-induced hypertension

21189

4.69

  

Incompetent cervix

703

0.16

  

Previous preterm infant

4215

0.93

  

Rh sensitization

6032

1.34

  

Tocolysis

15749

3.49

  

Overall Preterm (estgest < 37)

No

410346

90.84

  

Yes

40550

8.98

  

Missing estgest value

846

0.19

  

Total exclusions for anomalies**

9229

2.04

  

Multiple births or missing information on number born

9950

2.20

  

Out of state resident***

10926

2.42

  
  1. * More than one risk factor may be present per unique record.
  2. ** Excluded anomalies: Anecephalus, Spina Bifida, Hydrocephalus, Microcephalus, Other Central Nervous System Anomaly, Heart Malfunction, Other Circulatory/Respiratory Anomaly, Rectal Atresia/Stenosis, Other Gastrointestinal Anomaly, Undescended Testicle, Hypospadias and Epispadias, Other Malformed Genitalia, Renal Agenesis, Other Urogenital Anomaly, Cleft Lip, Cleft Palate, Polydactyly, Syndactyly, Other Reduction Deformities, Congenital Dislocation of Hip, Other Musculoskeletal Integration, Down's Syndrome, Chromosomal Anomaly, Other Congenital Anomaly, and Undesignated Congenital Anomaly.
  3. ***This variable was included because of the large number of foreign nationals in New Mexico.
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BMC Pregnancy and Childbirth

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