TABLE 1.
Baseline Characteristics of Analytic Sample Stratified by Contraceptive Method and Age STI, sexually transmitted infection.
| Adolescents (14–19 years) | Adults (20–45 years) | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Overall (n=6153) |
Non- LARC (n=1730) |
LARC (n=4423) |
P | Non- LARC (n=289) |
LARC (n=611) |
P | Non- LARC (n=1441) |
LARC (n=3812) |
P | |||
| Mean | SD | Mean(SD) | Mean(SD) | Mean(SD) | Mean(SD) | Mean(SD) | Mean(SD) | |||||
| Age | 25.2 | 5.8 | 24.1(5.1) | 25.6(6.0) | <0.001 | 18.6(1.3) | 17.6(1.4) | <0.001 | 25.3(4.7) | 26.9(5.5) | <0.001 | |
| n | % | % | % | % | % | % | % | |||||
| Race | 0.243 | 0.062 | 0.184 | |||||||||
| Black | 3017 | 49.0 | 50.3 | 48.5 | 56.7 | 62.8 | 49.0 | 46.2 | ||||
| White | 2661 | 43.3 | 41.6 | 43.9 | 32.9 | 30.8 | 43.3 | 46.0 | ||||
| Others | 474 | 7.7 | 8.1 | 7.6 | 10.4 | 6.4 | 7.6 | 7.7 | ||||
| Education | <0.001 | <0.001 | <0.001 | |||||||||
| Less than high school or high school | 2154 | 35.0 | 31.1 | 36.6 | 63.0 | 75.8 | 24.7 | 30.3 | ||||
| Some college | 2601 | 42.3 | 44.2 | 41.6 | 36.7 | 24.1 | 45.7 | 44.4 | ||||
| College/grad | 1395 | 22.7 | 24.8 | 21.9 | 0.3 | 0.2 | 29.7 | 25.4 | ||||
| Income | <0.001 | 0.201 | 0.001 | |||||||||
| None | 1161 | 19.2 | 17.4 | 20.0 | 37.9 | 40.7 | 13.4 | 16.7 | ||||
| $1–800 | 1933 | 32.0 | 35.6 | 30.7 | 54.0 | 48.2 | 32.1 | 27.9 | ||||
| $801–1600 | 1757 | 29.1 | 29.3 | 29.1 | 6.6 | 10.2 | 33.7 | 32.1 | ||||
| $1601+ | 1181 | 19.6 | 17.7 | 20.3 | 1.5 | 1.0 | 20.8 | 23.4 | ||||
| Body mass index | <0.001 | <0.001 | <0.001 | |||||||||
| Underweight (<18.5) | 178 | 2.9 | 4.8 | 2.1 | 7.6 | 2.8 | 4.2 | 2.0 | ||||
| Normal (18.5–24.9) | 2406 | 39.1 | 46.6 | 36.2 | 61.9 | 48.1 | 43.6 | 34.2 | ||||
| Overweight (25.0–29.9) | 1582 | 25.7 | 22.7 | 26.9 | 14.2 | 26.0 | 24.4 | 27.0 | ||||
| Obese (≥30.0) | 1987 | 32.3 | 25.9 | 34.8 | 16.3 | 23.1 | 27.8 | 36.7 | ||||
| Receiving public assistance | <0.001 | <0.001 | <0.001 | |||||||||
| No | 3937 | 64.0 | 73.9 | 60.2 | 81.7 | 69.0 | 72.3 | 58.8 | ||||
| Yes | 2210 | 36.0 | 26.1 | 39.8 | 18.3 | 31.0 | 27.7 | 41.2 | ||||
| Trouble paying at baseline | 0.050 | 0.365 | 0.005 | |||||||||
| No | 3712 | 60.4 | 58.5 | 61.2 | 76.4 | 73.6 | 54.9 | 59.2 | ||||
| Yes | 2430 | 39.6 | 41.5 | 38.8 | 23.6 | 26.4 | 45.1 | 40.8 | ||||
| Insurance | <0.001 | <0.001 | <0.001 | |||||||||
| None | 2603 | 42.6 | 48.1 | 40.5 | 36.0 | 29.6 | 50.4 | 42.2 | ||||
| Private | 2640 | 43.2 | 45.0 | 42.5 | 48.4 | 39.5 | 44.4 | 43.0 | ||||
| Public | 865 | 14.2 | 6.9 | 17.0 | 15.6 | 30.9 | 5.2 | 14.8 | ||||
| Gravidity | <0.001 | <0.001 | <0.001 | |||||||||
| 0 | 1775 | 28.8 | 42.5 | 23.5 | 60.9 | 42.6 | 38.9 | 20.4 | ||||
| 1 | 1342 | 21.8 | 23.3 | 21.2 | 28.7 | 39.6 | 22.2 | 18.3 | ||||
| 2 | 1105 | 18.0 | 14.6 | 19.3 | 8.0 | 13.4 | 15.9 | 20.2 | ||||
| 3+ | 1931 | 31.4 | 19.6 | 36.0 | 2.4 | 4.4 | 23.0 | 41.1 | ||||
| Parity | <0.001 | <0.001 | <0.001 | |||||||||
| 0 | 2878 | 46.8 | 64.6 | 39.8 | 88.2 | 72.7 | 59.8 | 34.5 | ||||
| 1 | 1531 | 24.9 | 19.5 | 27.0 | 11.4 | 22.9 | 21.2 | 27.6 | ||||
| 2 | 1068 | 17.4 | 10.3 | 20.1 | 0.3 | 3.8 | 12.4 | 22.7 | ||||
| 3+ | 676 | 11.0 | 5.5 | 13.1 | 0.0 | 0.7 | 6.7 | 15.1 | ||||
| Unintended pregnancies | <0.001 | <0.001 | <0.001 | |||||||||
| 0 | 2153 | 35.1 | 47.3 | 30.3 | 63.1 | 45.5 | 44.1 | 27.8 | ||||
| 1 | 1681 | 27.4 | 27.1 | 27.5 | 27.5 | 39.3 | 27.0 | 25.6 | ||||
| 2 | 1038 | 16.9 | 12.7 | 18.5 | 7.3 | 12.1 | 13.8 | 19.6 | ||||
| 3+ | 1269 | 20.7 | 12.9 | 23.7 | 2.1 | 3.1 | 15.1 | 27.0 | ||||
| Ever abortion at baseline | 0.019 | 0.603 | 0.023 | |||||||||
| No | 3859 | 62.7 | 65.0 | 61.8 | 78.2 | 79.7 | 62.4 | 58.9 | ||||
| Yes | 2294 | 37.3 | 35.0 | 38.2 | 21.8 | 20.3 | 37.6 | 41.1 | ||||
| History of STI | 0.019 | 0.043 | 0.167 | |||||||||
| No | 3730 | 60.7 | 63.0 | 59.7 | 79.2 | 73.0 | 59.7 | 57.6 | ||||
| Yes | 2420 | 39.3 | 37.0 | 40.3 | 20.8 | 27.0 | 40.3 | 42.4 | ||||
| Any STI at baseline | 0.850 | 0.886 | 0.819 | |||||||||
| No | 5585 | 93.4 | 93.3 | 93.4 | 92.8 | 92.5 | 93.4 | 93.5 | ||||
| Yes | 397 | 6.6 | 6.7 | 6.6 | 7.2 | 7.5 | 6.6 | 6.5 | ||||