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. 2015 Apr 8;42(1):36–42. doi: 10.1136/jfprhc-2014-101046

Table 3.

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).