Table 1.
Baseline characteristics of participants receiving LNG-IUS stratified by amenorrheic status at 12 months (n=1802)
| Characteristic | Total (n=1802) | Amenorrheic at 12 months (n=278) | Non-amenorrheic at 12 months (n=1524) | p-value |
|---|---|---|---|---|
| Age | <0.01 | |||
| <18 | 42 (2.3) | 10 (3.6) | 32 (2.1) | |
| 18–20 | 209 (11.6) | 31 (11.2) | 178 (11.7) | |
| 21–25 | 720 (40.0) | 126 (45.3) | 594 (39.0) | |
| 26–30 | 465 (25.8) | 75 (27.0) | 390 (25.6) | |
| >30 | 366 (20.3) | 36 (12.9) | 330 (21.7) | |
| Race | <0.01 | |||
| Black | 814 (45.1) | 88 (31.7) | 726 (47.6) | |
| White | 855 (47.4) | 174 (62.6) | 681 (44.7) | |
| Other | 133 (7.4) | 16 (5.8) | 117 (7.7) | |
| Hispanic ethnicity | 78 (4.3) | 11 (4.0) | 67 (4.4) | 0.74 |
| Marital status | 0.43 | |||
| Single/never married | 1041 (57.8) | 169 (60.8) | 872 (57.3) | |
| Married/living with partner | 638 (35.4) | 94 (33.8) | 544 (35.7) | |
| Separated/divorced/widowed | 122 (6.8) | 15 (5.4) | 107 (7.0) | |
| Education level | 0.18 | |||
| < High school | 462 (25.6) | 61 (21.9) | 401 (26.3) | |
| Some college | 801 (44.5) | 123 (44.2) | 678 (44.5) | |
| College/grad | 538 (29.9) | 94 (33.8) | 444 (29.2) | |
| Gravidity | <0.01 | |||
| 0 | 515 (28.6) | 120 (43.2) | 395 (25.9) | |
| 1 | 370 (20.5) | 53 (19.1) | 317 (20.8) | |
| 2 | 341 (18.9) | 46 (16.5) | 295 (19.4) | |
| ≥3 | 576 (31.9) | 59 (21.2) | 517 (33.9) | |
| Prior contraceptive use at time of enrollment | <0.01 | |||
| PPR | 522 (29.0) | 111 (39.9) | 411 (27.0) | |
| LARC (IUD or implant) | 23 (1.3) | 1 (0.4) | 22 (1.4) | |
| DMPA | 31 (1.7) | 4 (1.4) | 27 (1.8) | |
| Other | 708 (39.3) | 99 (35.6) | 609 (40.0) | |
| None | 518 (28.7) | 63 (22.7) | 455 (29.9) | |
| BMI (kg/m2) | 0.02 | |||
| <18.5 | 41 (2.3) | 4 (1.5) | 37 (2.5) | |
| 18.5–24.9 | 666 (37.0) | 120 (43.8) | 546 (36.2) | |
| 25–29.9 | 481 (26.7) | 78 (28.5) | 403 (26.7) | |
| ≥30 | 593 (32.9) | 72 (26.3) | 521 (34.6) | |
| Any history of STI (excluding BV & PID) | 705 (39.1) | 87 (31.3) | 618 (40.6) | <0.01 |
Data are presented as n (%).
PPR = pill, patch or ring; LARC = long-acting reversible contraception; IUD = intrauterine device; DMPA = depot medroxyprogesterone acetate injection