Abstract:
:An improved statistical method for assessing the efficacy of intrauterine contraception is presented. This method, called the log-rank method, is based on a daily life table, which yields the best estimates of the cumulative net termination probabilities. It provides a sensitive chi-square test statistic to detect differences among these probabilities for two or more contraceptive devices. When three or more devices are compared, the chi-square statistic may be partitioned into additive components representing comparisons among groups of devices. The log-rank method also permits adjusting for differences among subgroups by controlling for factors such as parity or age. Although calculations may be performed on a desk calculator, a FORTRAN-IV computer program is made available to interested researchers. :A new procedure for the statistical evaluation of IUDs, the log-rank method, is presented. The log-rank method is based on a daily life table. Comparisons of 2 or more devices are made by examining cumulative net probabilities of termination for any reason. The data required for analysis include patient identification, IUD type, date of insertion, date the patient was last seen or date of termination, and the reason for termination. Steps for calculating the cumulative net termination probabilities are presented. The method provides a sensitive chi-square test to detect differences among net terminiation probabilities. When there are more than 3 devices to compare, the chi-square statistic may be partitioned into additive components representing comparisons among groups of devices. It is also possible to adjust the method for such subgroup differences as parity and age. 2 applications of this method, performed with the FORTRAN-4 computer are presented. 3 IUDs are compared: TCu-300, the Dalkon Shield, and SCS-D. Results from the original study correlated with results using the log-rank method. In the 2nd application the log-rank analysis of 589 women using either the Lippes Loop or the Dalkon Shield is given. This statistical method is also useful in comparing other methods of contraception.
journal_name
Am J Obstet Gynecoljournal_title
American journal of obstetrics and gynecologyauthors
Azen SP,Roy S,Pike MC,Casagrande J,Mishell DR Jrdoi
10.1016/0002-9378(77)90632-9subject
Has Abstractpub_date
1977-06-01 00:00:00pages
329-35issue
3eissn
0002-9378issn
1097-6868pii
0002-9378(77)90632-9journal_volume
128pub_type
杂志文章abstract:OBJECTIVE:The study evaluates lipids profile changes during gestation in pregnancies with and without preeclampsia and/or gestational diabetes. STUDY DESIGN:Lipid profiles were assessed between year prior and after pregnancy in 9911 women without cardiovascular comorbidities. RESULTS:Lipid levels during gestation var...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/j.ajog.2009.05.032
更新日期:2009-11-01 00:00:00
abstract:OBJECTIVES:Our purpose was to investigate the benefit, if any, of automated blood pressure monitoring over obstetric day unit conventional blood pressure measurement in the assessment of hypertensive pregnancies. STUDY DESIGN:A prospective, observational study was carried out in two large teaching hospitals. Three hun...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/s0002-9378(98)70432-6
更新日期:1998-03-01 00:00:00
abstract:OBJECTIVE:This study evaluated faculty compliance in the use of the global surgical rating scale of the Objective Structured Assessment of Technical Skills to rate resident surgical performance after every endoscopic procedure. STUDY DESIGN:For this prospective cohort study, 4 faculty members in the Minimally Invasive...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/j.ajog.2005.07.081
更新日期:2005-11-01 00:00:00
abstract::Endometrial biopsies at varying times in the menstrual cycle were obtained from 30 healthy women (16-41 years) to be used as controls, and 19 women (16-36 years), who wore an IUD (Mazlin spring, Lippes loop, or Birnburg bow) for from 5 months to 4 years, in order to study histological changes in the endometrium in th...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/0002-9378(70)90508-9
更新日期:1970-04-15 00:00:00
abstract::We describe two patients with laparoscopically diagnosed, severe acute salpingitis who had nontypable Haemophilus influenzae isolated directly from the fallopian tubes. Nontypable H. influenzae should be recognized as an important genital pathogen. ...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/0002-9378(85)90299-6
更新日期:1985-02-01 00:00:00
abstract:OBJECTIVE:This study was undertaken to determine whether preoperative radioimmunoscintigraphy of complex ovarian masses with technetium Tc 99m MAb-170 (Tru-Scint AD; Biomira Inc, Edmonton, Alberta, Canada), a murine whole immunoglobulin G monoclonal antibody that has been found to have panadenocarcinoma affinity, would...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1067/mob.2000.105938
更新日期:2000-09-01 00:00:00
abstract::Previous studies in our laboratory have suggested that measurement of methylumbelliferylguanidinobenzoate (MUGB) reactive proteases in midtrimester amniotic fluid is potentially of value for the intrauterine detection of cystic fibrosis. Thirty-nine pregnancies of obligate heterozygotes of cystic fibrosis and 12 cases...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/s0002-9378(16)32679-5
更新日期:1981-12-15 00:00:00
abstract::Assisted reproductive technologies have aided thousands of couples, but complications have resulted in multifetal pregnancies creating a bitter irony for infertility patients. In an effort to increase the rate of intact survival, we have successfully performed transabdominal first-trimester selective termination proce...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/0002-9378(90)90922-t
更新日期:1990-06-01 00:00:00
abstract::Twenty-one Caucasian couples with two or more idiopathic fetal losses and with either no live-born children or with only one live-born child were typed for HLA-A, B, and DR antigens, and mixed lymphocyte responses of the maternal lymphocytes to stimulation by paternal lymphocytes were studied. The mixed lymphocyte res...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/0002-9378(85)90379-5
更新日期:1985-04-15 00:00:00
abstract:OBJECTIVES:Preeclampsia is associated with hypertension, fetal growth retardation, and proteinuria. We hypothesized that impaired vascular nitric oxide synthesis during pregnancy may be an important causal factor in preeclampsia. STUDY DESIGN:An inhibitor of nitric oxide synthase, L-nitro-arginine methyl ester, or a n...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/0002-9378(93)90299-x
更新日期:1993-11-01 00:00:00
abstract:OBJECTIVE:Our purpose was to evaluate the influence of the route of drug administration and target tissue vascularity on the distribution of a photosensitizer, Photofrin porfimer sodium, in the uterus. STUDY DESIGN:The study was divided in two phases. In phase I 80 mature female rats were hormonally suppressed and the...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/0002-9378(93)90517-m
更新日期:1993-02-01 00:00:00
abstract::Vaginal administration of prostaglandin analogues resulted in cervical changes that facilitated dilatation and evacuation in 80 patients in the late first trimester and the second trimester of pregnancy. When 0.5 mg and 1.0 mg of 15(S)-15-methyl-prostaglandin F2 alpha (15-ME-PGF2 alpha) was compared to 30 and 60 mg of...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/0002-9378(82)90179-x
更新日期:1982-12-15 00:00:00
abstract:OBJECTIVE:The objective of this investigation was to characterize soluble endoglin (sEng) concentrations in second-trimester serum of women who either develop preeclampsia or have a normal pregnancy. STUDY DESIGN:Single second-trimester serum samples obtained from healthy, nonsmoking women who subsequently developed s...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/j.ajog.2007.03.058
更新日期:2007-08-01 00:00:00
abstract:BACKGROUND:Intra-amniotic infection or inflammation (IAI) is common in early preterm birth and associated with significant neonatal lung morbidity due to fetal exposure to pro-inflammatory cytokines and infectious organisms. Amniotic fluid interleukin-8 (IL-8), a pro-inflammatory cytokine, was previously correlated wit...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/j.ajog.2020.12.1214
更新日期:2021-01-04 00:00:00
abstract:OBJECTIVE:The purpose of this study was to report the distribution of pelvic support among a population-based sample of middle-aged community-dwelling women, as defined by pelvic organ prolapse quantification (POP-Q) and study factors that might influence POP-Q measurements. STUDY DESIGN:We conducted a secondary analy...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/j.ajog.2008.01.054
更新日期:2008-05-01 00:00:00
abstract:OBJECTIVE:The objective of this study was to compare different management strategies for women at risk for cervical incompetence. STUDY DESIGN:In an ongoing randomized trial patients with a previous preterm delivery at <34 weeks' gestation who met clinical criteria for the diagnosis of cervical incompetence are alloca...
journal_title:American journal of obstetrics and gynecology
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1067/mob.2000.108874
更新日期:2000-10-01 00:00:00
abstract::The aim of this multiinstitutional study was to evaluate a new cervical indwelling catheter in 84 patients with premature rupture of the membranes at less than 33 weeks' gestation. The average time of insertion of the catheter was 29.1 weeks' gestation, at an average of 2.0 days after rupture, and was left in place fo...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/s0002-9378(88)80080-2
更新日期:1988-08-01 00:00:00
abstract:OBJECTIVES:Our goals were to determine the mortality risk for infants weighing 501 to 1500 gm according to gestational age, birth weight, and gender and to document birth weight-related changes in mortality and morbidity over a 5-year time period. STUDY DESIGN:In this observational study perinatal data were prospectiv...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章,多中心研究
doi:10.1016/0002-9378(95)90628-2
更新日期:1995-11-01 00:00:00
abstract:OBJECTIVE:The objective of this study was to determine the accuracy of clinical assessment of paravaginal defects in women with anterior vaginal wall prolapse. STUDY DESIGN:A retrospective chart review of all women undergoing surgery for anterior vaginal wall prolapse during the years of 1994 to 1996 identified operat...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/s0002-9378(99)70440-0
更新日期:1999-07-01 00:00:00
abstract:OBJECTIVE:The purpose of this study was to describe trends and outcomes of planned births. STUDY DESIGN:Data from linked birth and hospital records for 779,521 singleton births at ≥33 weeks' gestation from 2001-2009 were used to determine trends in planned births (prelabor cesarean section and labor inductions). Adver...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/j.ajog.2012.06.082
更新日期:2012-09-01 00:00:00
abstract::The presence and number of mast cells and their relationship to other inflammatory cells were investigated in smears from intrauterine contraceptive devices. The results obtained suggest a possible role of mast cells in the mechanism of action of intrauterine contraceptive devices, on the basis of the peculiar known f...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/s0002-9378(84)90446-0
更新日期:1984-04-15 00:00:00
abstract:OBJECTIVE:Our purpose was to demonstrate the clinical efficacy and effect of hormone replacement therapy in menopause on quality of life. STUDY DESIGN:A randomized, open, 6-month comparison of hormone replacement therapy (estradiol transdermal system [Estraderm TTS] plus chlormadinone) and symptomatic treatment (verap...
journal_title:American journal of obstetrics and gynecology
pub_type: 临床试验,杂志文章,多中心研究,随机对照试验
doi:10.1016/s0002-9378(94)70239-x
更新日期:1994-02-01 00:00:00
abstract::Prospectively collected information on blood pressure and proteinuria was available for geographically defined populations of primigravidas in Burma, China, Thailand, and Viet Nam. Clinically recognized hypertension during pregnancy varied by a factor of 25 between countries, and even a strict definition of proteinuri...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:
更新日期:1988-01-01 00:00:00
abstract:OBJECTIVE:We evaluated the effects of coliform endotoxin on the circulating levels of atrial natriuretic factor and renal function. To understand the direct effects of endotoxin in the release of atrial natriuretic factor by cardiac tissue, studies in isolated rat atria were performed. STUDY DESIGN:In vivo studies wer...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/s0002-9378(98)70246-7
更新日期:1998-07-01 00:00:00
abstract::783 aborters and 430 abortuses were studied in a prospective cytogenetic survey which attempted to link chromosome abnormalities and history of recurrent abortion. 425 female and 358 male spontaneous aborters and their 430 abortuses (310 were karotyped) showed 4 women and 2 men as balanced translocation carriers (3 R...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/0002-9378(78)90470-2
更新日期:1978-05-01 00:00:00
abstract:OBJECTIVE:Betamethasone administration in singleton pregnancies causes maternal hyperglycemia. With the increased risk of glucose intolerance in twin pregnancies, we sought to determine whether maternal hyperglycemia after dexamethasone administration is different in twin vs singleton pregnancies. STUDY DESIGN:Patient...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/j.ajog.2008.08.004
更新日期:2008-10-01 00:00:00
abstract:OBJECTIVE:Cerebral palsy (CP) is characterized by motor deficits. There is increasing evidence that CP may result from inflammatory and infection-mediated white matter damage. Our objective was to develop an inflammatory model for CP based on chronic lipopolysaccharide (LPS) exposure with a recognizable phenotype in of...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/j.ajog.2005.05.072
更新日期:2005-09-01 00:00:00
abstract::Colposacropexy procedures restore anatomically correct apical vaginal support on the levator plate at the ischial spine level. Venous hemorrhage resulting from laceration of presacral veins during suture fixation is the major hazard of this procedure. Titanium orthopedic bone anchor fixation minimizes this risk throug...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/s0002-9378(97)70361-2
更新日期:1997-06-01 00:00:00
abstract::In 1970 Morgan described an operation designed to meet the problem created by scarring and fibrosis resulting from previous operative procedures to the urethra and bladder neck. In the method, a 2 cm wide polypropylene (Marlex) mesh is placed as a broad hammock to elevate and support the urethrovesical junction with l...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/0002-9378(79)90681-1
更新日期:1979-02-01 00:00:00
abstract::The spiral arteries of the placental bed lose clearly recognizable arterial features early in pregnancy because of their invasion by extravillous trophoblast. Extensive structural alterations take place in the walls of invaded arteries, their walls containing an amorphous acidophilic "fibrinoid" matrix in which endova...
journal_title:American journal of obstetrics and gynecology
pub_type: 杂志文章
doi:10.1016/0002-9378(84)90393-4
更新日期:1984-12-15 00:00:00