Table 4.
Multiple Linear Regression Model of Sociodemographic Characteristics associated with Gestational Age When Certain of Pregnancy and at First Prenatal Visit
| Gestational Age when Certain of Pregnancy (weeks) | Gestational Age at First Prenatal Visit (weeks) | |||
|---|---|---|---|---|
| Estimated Regression Coefficient (95% CI) | Tests of Model Effectsa | Estimated Regression Coefficient (95% CI) | Tests of Model Effectsa | |
| Race | ||||
| White (ref) | – | 0.010 | – | 0.001 |
| Black | 0.9(0.3, 1.5) | − 0.1(− 0.8, 0.5) | ||
| Asian | 0.6(0, 1.2) | 2.8(1.5, 4.0) | ||
| Native North American | 0.8(0.2, 1.4) | − 0.1(− 1.2, 1.0) | ||
| Other race | 0.1(− 0.7, 0.5) | − 0.4(− 1.1, 0.3) | ||
| Mixed race | 0.9(− 0.4, 2.1) | 0.1(− 0.9, 1.1) | ||
| Ethnicity | ||||
| Non-Hispanic (ref) | – | 0.671 | – | 0.222 |
| Hispanic | 0.1(− 0.5, 0.7) | − 0.3(− 0.9, 0.2) | ||
| Maternal Age | ||||
| < 18 | 3.6(1.6, 5.5) | 0.001 | 7.8(2.9, 12.8) | < 0.001 |
| 18–24 | 0.3(− 0.3, 1.0) | 1.7(1.1, 2.3) | ||
| 25–34 | − 0.1(− 0.6, 0.4) | 0.5(0.1, 0.8) | ||
| > 35 (ref) | – | – | ||
| Nutrition Program for Women, Infant and Child Participation | ||||
| Yes | − 0.4(− 1.0, 0.2) | 0.151 | − 0.8(− 1.3, − 0.3) | 0.003 |
| No (ref) | – | – | ||
| Education | ||||
| < High school degree | 1.9(0.8, 3.0) | < 0.001 | 2.9(2.0, 3.9) | < 0.001 |
| High school graduate/GED | 1.2(0.5, 2.0) | 1.8(1.2, 2.3) | ||
| Some college/associate degree | 0.6(0.2, 1.0) | 0.7(0.3, 1.1) | ||
| ≥ Bachelor's degree (ref) | – | – | ||
| Previous Births | ||||
| 0 births | − 1.0(− 1.6, − 0.4) | 0.002 | − 2.0(− 2.6, − 1.4) | < 0.001 |
| 1–2 births | − 0.6(− 1.2, 0.1) | − 1.6(− 2.2, − 1.0) | ||
| ≥ 3 births (ref) | – | – | ||
| Marital Status | ||||
| Married (ref) | – | 0.001 | – | < 0.001 |
| Not married | 0.8(0.3, 1.3) | 1.2(0.8, 1.7) | ||
| Weight Status | ||||
| Underweight | 0.2(− 0.5,1.0) | 0.002 | − 0.5(− 1.4, 0.4) | 0.573 |
| Normal Weight (ref) | – | – | ||
| Overweight | − 0.6(− 1.0,− 0.2) | − 0.1(− 0.6, 0.3) | ||
| Obese | 0.1(− 0.5,0.6) | 0.1(− 0.4, 0.6) | ||
Bold text indicates the difference between the level of interest and the reference is significant with 95% confidence
aP value based on F-test for Type 3 Analysis of Effects