Table 1

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

* More than one risk factor may be present per unique record.

** 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.

***This variable was included because of the large number of foreign nationals in New Mexico.

Gwin et al.

Gwin et al. BMC Pregnancy and Childbirth 2012 12:53   doi:10.1186/1471-2393-12-53

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