Recommended Procedures for the Statistical Evaluation of Intrauterine Contraception

Tietze, Christopher; Lewit, Sarah

doi:10.2307/1964828

Cited by 155 publications

(54 citation statements)

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“…A life-table method was used with definitions and recommendations as proposed by Tietze et al [4], and differences between groups were tested with the log-rank x method [5]. Analysis of the dally bleeding calendars was based upon completed 90-day reference periods according to the methodology developed by Rodrignez et al [6].…”

Section: Methodsmentioning

confidence: 99%

Three years' experience with levonorgestrel-releasing intrauterine device and Norplant-2 implants: a randomized comparative study

Wang

Xin³

et al. 1992

Adv Contracept

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A randomized comparative study of levonorgestrel-releasing intrauterine device (LNG-IUD) and Norplant-2 implants was carried out in 200 women for 36 months. Three thousand one hundred woman-months of use were observed with each device. Only one pregnancy occurred in users of LNG-IUD at the 12th month of use. The change in bleeding pattern was the most frequent reason for discontinuation. The discontinuation rate for irregular bleeding with Norplant-2 was 17.3 and 26.8 at 24 and 36 months, respectively, as compared to 3.3 with LNG-IUD at both 24 and 36 months. The differences were statistically significant. Removal for amenorrhea and pain only occurred in acceptors of LNG-IUD. About 20-40% of women using Norplant-2 had prolonged bleeding through 36 months. The percentage of amenorrhea in LNG-IUD was the highest (29.3%) at the end of two years of use. More than 97% of subjects reported satisfaction with the methods used by themselves.

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Section: Methodsmentioning

confidence: 99%

Three years' experience with levonorgestrel-releasing intrauterine device and Norplant-2 implants: a randomized comparative study

Wang

Xin³

et al. 1992

Adv Contracept

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“…The data were all cut off at the point of last contact. It should be noted that the life-table method according to Tietze and Lewit [10] may not give adequate results if applied to clinical data during the course of study. When the Tietze method of computation without the individual cut-off date is used, very low LFU and termination rates are reported, when, in fact, quite a high percentage of women in the study have been observed for only a limited period of time.…”

Section: Methodsmentioning

confidence: 99%

A New Zealand randomized comparative study of three IUDs (Nova-T, MLCu375, MLAgCu250): 1-, 2- and 3-year results

1992

Adv Contracept

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A randomized comparative study was made in New Zealand of 3 models of copper IUDs, the Nova-T, MLCu375 and MLAgCu250, with interval acceptors. Completing 3 years of use, there were 608 Nova-T (14,011 woman-months), 586 MLCu375 (14,161 woman-months) and 596 MLAgCu250 (14,614 woman-months). At 3 years, loss to follow-up was 5.2% for the Nova-T, 5.1% for the MLCu375 and 4.1% for the MLAgCu250. The Multiloads were significantly easier to insert and were preferred by the operators, as the insertion technique for the Nova-T was complicated. However, the Nova-T was significantly easier to remove. There was one perforation with a Nova-T in a puerperal breastfeeding woman. In the only 2 parameters that are comparable between series, accidental pregnancy and expulsion [1], the Multiloads have been shown to be superior with higher relevant continuation rates. At 3 years, the MLCu375 had a significantly lower accidental pregnancy rate and higher relevant continuation rate. The results obtained with the Nova-T are similar to those of the WHO study [2]. The MLCu375, with its potential for use up to 5 years, has been shown to be the superior device.

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“…Patients were followed up by examination 1, 3, 6 and 12 months after abdominal delivery. Event rates were calculated by life-table analysis [5]. Statistical significance of rate differences was assessed by comparison of two proportions [6].…”

Section: Materiais and Methodsmentioning

confidence: 99%

IUD insertion during cesarean section

1985

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An IUD (TCu220C) was inserted in 82 women during low-transverse cesarean section. No untoward effect on puerperal morbidity or lactation was observed and no serious complications occurred in this series. At 12 months the rates were zero for pregnancy and 7.7 for expulsion; the latter figure is comparable to that reported after immediate postplacental insertion of the same IUD model. Intracesarean IUD insertion is a procedure that deserves further promotion.

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Recommended Procedures for the Statistical Evaluation of Intrauterine Contraception

Cited by 155 publications

References 0 publications

Three years' experience with levonorgestrel-releasing intrauterine device and Norplant-2 implants: a randomized comparative study

Three years' experience with levonorgestrel-releasing intrauterine device and Norplant-2 implants: a randomized comparative study

A New Zealand randomized comparative study of three IUDs (Nova-T, MLCu375, MLAgCu250): 1-, 2- and 3-year results

IUD insertion during cesarean section

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