Continuation, expulsion and discontinuation: 12-month rates and study period Pearl indices
| Total | LNG-IUS | Cu T 380A | p | ||||
|---|---|---|---|---|---|---|---|
| 12-month n (%) | Study period n (PI) | 12-month n (%) | Study period n (PI) | 12-month n (%) | Study period n (PI) | ||
| Continuation | 81 (89) | 67 (93) | 14 (74) | 0.03 | |||
| Expulsion | 3 (3.3) | 3 (2.7) | 1 (1.4) | 1 (1.1) | 2 (10.5) | 2 (11.2) | |
| Discontinuation | 7 (7.7) | 8 (7.1) | 4 (5.6) | 5 (5.3) | 3 (15.8) | 3 (16.9) | |
| Side effects | 5 (5.5) | 6 (5.3) | 3 (4.2) | 4 (4.2) | 2 (10.5) | 2 (16.9) | |
| Pregnancy | 1 (1.1) | 1 (0.9) | 0 | 0 | 1 (5.3) | 1 (5.6) | |
| Lack of benefit | 1 (1.1) | 1 (0.9) | 1 (1.4) | 1 (1.1) | 0 | 0 | |
| Total n for 12-month rates | 91 | 72 | 19 | ||||
| Woman-years observation for PI | 112.8 | 95.0 | 17.8 | ||||
Two-tailed p value calculated with Fisher's exact test for difference between intrauterine device types. p values not shown if >0.05.
Cu T 380A, copper intrauterine device; LNG-IUS, levonorgestrel intrauterine system; PI, Pearl index (=number of events per 100 woman-years).