Table 2.
Baseline Characteristics of Cohort Stratified by Chosen Contraceptive Method
| All users (n=4144)‡ Mean (SD) | LNG-IUD (n=1958) Mean (SD) | Copper IUD (n=447) Mean (SD) | Implant (n=541) Mean (SD) | DMPA (n=316) Mean (SD) | Pill/Patch/Ring (n=880) Mean (SD) | |
|---|---|---|---|---|---|---|
| Age at enrollment* | 25.2 (5.8) | 25.8 (5.7) | 28.1 (6.2) | 23.0 (5.9) | 24.5 (5.9) | 24.0 (4.8) |
| Age first had sex* | 16.3 (2.5) | 16.2 (2.4) | 16.3 (3.1) | 15.7 (2.2) | 15.9 (2.1) | 16.8 (2.5) |
| % | % | % | % | % | % | |
| Education* | ||||||
| Less than high school/High school | 37.3 | 35.5 | 29.8 | 57.3 | 52.4 | 27.7 |
| Some college | 41.6 | 43.6 | 41.2 | 32.2 | 38.1 | 44.7 |
| College/Grad degree | 21.0 | 21.0 | 29.1 | 10.5 | 9.5 | 27.6 |
| Hispanic Ethnicity* | 5.0 | 4.2 | 7.4 | 8.0 | 2.2 | 4.7 |
| Race* | ||||||
| Black | 50.9 | 50.9 | 39.0 | 58.3 | 72.7 | 44.9 |
| White | 41.5 | 42.3 | 51.3 | 33.3 | 21.6 | 46.9 |
| Other | 7.5 | 6.8 | 9.6 | 8.4 | 5.7 | 8.2 |
| Marital status* | ||||||
| Never married | 59.5 | 55.6 | 45.7 | 64.9 | 63.0 | 70.7 |
| Married/Living with Partner | 34.0 | 37.8 | 42.6 | 29.7 | 26.9 | 26.5 |
| Separated/Divorced/Widowed | 6.5 | 6.6 | 11.7 | 5.4 | 10.1 | 2.8 |
| Monthly individual income* | ||||||
| None | 19.0 | 17.2 | 17.3 | 29.9 | 22.7 | 15.6 |
| $1-800 | 32.5 | 30.6 | 29.7 | 35.3 | 34.2 | 35.7 |
| $801-1600 | 29.8 | 31.5 | 28.8 | 24.4 | 28.8 | 30.3 |
| $1601+ | 18.8 | 20.8 | 24.1 | 10.4 | 14.4 | 18.4 |
| Insurance* | ||||||
| None | 45.3 | 43.2 | 44.6 | 44.0 | 59.0 | 46.4 |
| Private | 41.4 | 42.4 | 43.0 | 31.1 | 31.7 | 47.9 |
| Public | 13.3 | 14.4 | 12.4 | 24.9 | 9.2 | 5.6 |
| Government support/Trouble paying for basic necessities*§ | 58.9 | 61.5 | 58.7 | 64.3 | 65.2 | 47.5 |
| Gravidity* | ||||||
| 0 | 27.0 | 19.5 | 22.6 | 30.1 | 24.7 | 44.9 |
| 1 | 22.2 | 20.1 | 14.5 | 29.8 | 24.1 | 25.3 |
| 2 | 18.3 | 21.8 | 17.7 | 14.0 | 16.1 | 14.4 |
| 3+ | 32.5 | 38.7 | 45.2 | 26.1 | 35.1 | 15.3 |
| Parity* | ||||||
| 0 | 45.6 | 35.5 | 36.5 | 49.0 | 48.4 | 69.3 |
| 1 | 25.2 | 28.7 | 22.1 | 27.0 | 21.5 | 19.1 |
| 2 | 18.1 | 22.5 | 22.1 | 14.6 | 17.7 | 8.4 |
| 3+ | 11.2 | 13.3 | 19.2 | 9.4 | 12.3 | 3.2 |
| Number of children desired* | ||||||
| Don't Know | 2.6 | 2.5 | 2.5 | 2.0 | 1.6 | 3.6 |
| 0 | 7.5 | 7.3 | 10.3 | 8.6 | 6.6 | 5.2 |
| 1 | 13.0 | 12.8 | 13.9 | 12.6 | 12.7 | 11.9 |
| 2 | 38.8 | 38.1 | 34.7 | 38.3 | 35.4 | 39.6 |
| 3+ | 40.6 | 39.3 | 38.7 | 38.5 | 43.7 | 39.7 |
| History of STI** | 33.7 | 35.1 | 31.1 | 34.4 | 42.7 | 28.1 |
| Lifetime sexual partners* | ||||||
| 0-1 | 9.3 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 |
| 2-4 | 26.8 | 26.9 | 20.1 | 32.0 | 28.8 | 26.1 |
| 5-9 | 32.4 | 32.5 | 31.1 | 29.2 | 36.4 | 33.2 |
| 10-19 | 19.6 | 21.0 | 21.9 | 14.4 | 17.1 | 19.5 |
| 20+ | 11.9 | 11.3 | 18.6 | 11.3 | 11.1 | 10.3 |
| Sexual partners last 30 days* | ||||||
| 0 | 19.4 | 19.0 | 16.8 | 25.0 | 17.4 | 18.9 |
| 1 | 73.6 | 74.9 | 77.2 | 68.6 | 72.5 | 72.6 |
| 2+ | 7.0 | 6.1 | 6.0 | 6.5 | 10.1 | 8.5 |
| Any unintended pregnancies† | 91.3 | 91.1 | 91.6 | 89.7 | 89.8 | 93.8 |
Note: due to rounding some columns exceed 100%
*
Statistically significant finding p<0.05
§
Public Assistance: current receipt of food stamps, WIC, welfare or unemployment; Trouble Paying Basic Expenses: transportation, housing, health or medical care, or food
**
History of STI: self-reported of history of chlamydia, gonorrhea, syphilis, trichomoniasis, genital herpes, human papillomavirus or human immunodeficiency virus
†
Among women who reported history of pregnancy (n=3017)
‡
2 Participants chose the natural family planning as their baseline contraceptive method