Four-year experience in a randomized study of the Gyne T 380 Slimline and the Standard Gyne T 380 intrauterine copper devices.
Performance of the Slimline and Standard models of the Gyne T 380 were measured through four years in a comparative study initially involving 996 women, seventy percent of whom were randomized to the Slimline device. Cumulative pregnancy rates of Slimline users were 0.3 +/- 0.2 per 100 both at three and at four years, as compared with rates of 1.5 +/- 0.9 and 3.8 +/- 1.7 at the same intervals for users of the Standard model (P > .05). The four-year explusion rate of the Slimline, 8.6 +/- 1.3 per 100, was significantly higher than the comparable rate of the Standard model, 4.4 +/- 1.6 (P < .05). The two Gyne T* models did not differ in continuation rates. First time IUD users, however, had substantially lower continuation rates than did former users (P < .001), in consequence of their relative youth and desire to have additional children. Other performance measures did not differ importantly by device.
Sivin
I
I
Population Council, Center for Biomedical Research, New York, New York 10021.
Diaz
J
J
Alvarez
F
F
Brache
V
V
Diaz
S
S
Pavez
M
M
Stern
J
J
D000293:Adolescent; D000328:Adult; D005260:Female; D006801:Humans; D007435:Intrauterine Devices, Copper / Q000009:adverse effects; D015993:Life Tables; D017060:Patient Satisfaction; D011247:Pregnancy