Table 2.
Adjusted odds ratios for risk of PTB by demographic and perinatal characteristics, New Mexico, 1991-2005
| Adjusted Odds Ratio | 95% Confidence Interval | p value | |
|---|---|---|---|
|
Maternal Age | |||
|
Reference age = 25-29 | |||
| Age Group | |||
| <15 |
1.9 |
1.47-2.46 |
<0.0001 |
| 15-19 |
1.22 |
1.15-1.30 |
<0.0001 |
| 20-24 |
1.07 |
1.02-1.13 |
0.0059 |
| 30-34 |
1.09 |
1.03-1.15 |
0.0037 |
| 35-39 |
1.25 |
1.17-1.35 |
<0.0001 |
| >40 |
1.34 |
1.18-1.52 |
<0.0001 |
|
Maternal Education Level | |||
|
Reference education level = 9-12 years | |||
| Number of years | |||
| <9 |
0.995 |
0.92-1.07 |
0.91 |
| 13-16 |
0.89 |
0.85-0.93 |
<0.0001 |
| >16 |
0.82 |
0.76-0.89 |
<0.0001 |
|
Maternal Ethnicity | |||
|
Reference ethnicity = White Non-Hispanic | |||
| Asian |
1.23 |
1.05-1.43 |
0.0087 |
| Other |
1.49 |
0.76-2.92 |
0.2452 |
| White Hispanic |
1.05 |
1.00-1.10 |
0.0372 |
| Native American |
0.88 |
0.82-0.95 |
0.0016 |
| Black |
1.37 |
1.22-1.54 |
<0.0001 |
|
Normal Risk Pregnancy and Level of Prenatal Care | |||
|
Reference level of care = Kotelchuck adequate | |||
| Kotelchuck Index | |||
| None |
4.92 |
4.53-5.34 |
<0.0001 |
| Inadequate |
2.16 |
2.02-2.30 |
<0.0001 |
| Intermediate |
0.93 |
0.85-1.01 |
0.0728 |
| High |
4.95 |
4.66-5.25 |
<0.0001 |
|
High Risk Pregnancy and Level of Prenatal Care | |||
| Kotelchuck Index | |||
| None |
14.66 |
12.92-16.64 |
<0.0001 |
| Inadequate |
4.78 |
4.34-5.26 |
<0.0001 |
| Intermediate |
2.59 |
2.26-2.97 |
<0.0001 |
| Adequate |
2.31 |
2.08-2.56 |
<0.0001 |
| High | 8.42 | 7.83-9.05 | <0.0001 |