Table 3.
Relative Risk Ratios from Multinomial Logistic Event History Models Predicting First Postpartum Contraceptive Use
| Highly effective vs. no method | Effective vs. no method | Least effective vs. no method | Effective vs. highly effective | Least effective vs. highly effective | Least effective vs. effective | |
|---|---|---|---|---|---|---|
| Intendedness | ||||||
| On time/too late | - | - | - | - | - | - |
| Slightly mistimed | 1.25 | 1.31 | 1.15 | 1.05 | 0.92 | 0.88 |
| Seriously mistimed | 1.93*** | 1.00 | 1.02 | 0.52** | 0.53** | 1.02 |
| Unwanted | 1.67** | 1.16 | 1.47* | 0.70 | 0.88 | 1.26 |
| Birth order | ||||||
| 1st birth | - | - | - | - | - | - |
| 2nd birth | 2.02*** | 0.91 | 1.36* | 0.45*** | 0.67* | 1.49 |
| 3rd or higher | 2.75*** | 0.75 | 0.94 | 0.27*** | 0.34*** | 1.26 |
| Insurance type | ||||||
| Private insurance | - | - | - | - | - | - |
| Medicaid | 1.39* | 0.87 | 0.90 | 0.63* | 0.64* | 1.03 |
| Other | 0.81 | 0.39*** | 0.99 | 0.48* | 1.22 | 2.55** |
| Timing of prenatal care | ||||||
| 1st trimester | - | - | - | - | - | - |
| 2nd trimester | 0.66* | 0.96 | 1.01 | 1.47 | 1.53 | 1.04 |
| 3rd trimester or never | 1.34 | 1.72 | 1.45 | 1.28 | 1.08 | 0.85 |
| Breastfeeding during the month | 0.76* | 0.87 | 1.35* | 1.16 | 1.78** | 1.54* |
| Race-ethnicity | ||||||
| Hispanic | 0.89 | 0.99 | 1.06 | 1.12 | 1.19 | 1.06 |
| Non-Hispanic white | - | - | - | - | - | - |
| Non-Hispanic black | 0.62** | 1.09 | 1.07 | 1.75* | 1.72* | 0.98 |
| Other | 0.78 | 0.88 | 1.17 | 1.14 | 1.44 | 1.26 |
| Foreign born | 0.72 | 0.74 | 0.91 | 1.03 | 1.26 | 1.22 |
| Age at birth | 1.01 | 0.95*** | 0.99 | 0.95*** | 0.98 | 1.04 |
| Union status (time-varying) | ||||||
| Single | 0.79 | 0.80 | 0.67* | 1.00 | 0.85 | 0.84 |
| Cohabiting | 0.91 | 1.18 | 0.65* | 1.30 | 0.71 | 0.55* |
| Married | - | - | - | - | - | - |
| Education | ||||||
| Less than HS | 0.91 | 1.43* | 0.67* | 1.58 | 0.73 | 0.47*** |
| HS/GED | - | - | - | - | - | - |
| Some college/AA | 1.13 | 1.35 | 0.74 | 1.20 | 0.66* | 0.55** |
| BA or higher | 0.83 | 1.17 | 0.72 | 1.41 | 0.86 | 0.61 |
| Months since birth | ||||||
| Birth month | 0.97 | 0.33*** | 0.49*** | 0.34*** | 0.50** | 1.45 |
| 1 mon after birth | - | - | - | - | - | - |
| 2 mos after birth | 1.09 | 0.93 | 1.74** | 0.85 | 1.59 | 1.87* |
| 3 mos after birth | 0.88 | 0.46** | 1.73** | 0.52 | 1.98* | 3.81*** |
| 4 mos after birth | 0.44** | 0.48** | 0.99 | 1.10 | 2.26* | 2.06* |
| 5 mos after birth | 0.42 | 0.21*** | 0.50* | 0.51 | 1.18 | 2.33 |
| 6 mos after birth | 0.10*** | 0.08*** | 0.42* | 0.77 | 4.24* | 5.54** |
| 7–12 mos after birth | 0.06*** | 0.09*** | 0.27*** | 1.46 | 4.35*** | 2.97** |
| 13–24 mos after birth | 0.04*** | 0.01*** | 0.10*** | 0.41 | 2.81* | 6.86*** |
| 25+ mos after birth | 0.01*** | 0.02*** | 0.08*** | 1.95 | 9.04 | 4.62 |
| Constant | 0.05*** | 0.78 | 0.19** | 15.62*** | 3.82 | 0.24* |
| Person-birth-months | 13,750 | |||||
| Births | 2,769 | |||||
| Women | 2,435 | |||||
*
p≤.05
**
p≤.01
***
p≤.001