Abstract：
:Case-control studies begin at the end. Two groups of patients, those with disease (cases) and those without (controls), are compared to determine the degree of exposure to a presumed risk factor. This research method is commonly used to study rare diseases or diseases that take years to develop. If a higher proportion of cases than controls has the exposure of interest, the exposure may be associated with illness. The strength of this association is measured by an "odds ratio," which is a good proxy for a relative risk when the illness in question is infrequent. Although some case-control studies are easy to do, all are easy to do poorly, especially because of selection bias in the choice of controls. A greater familiarity with the case-control study should enable obstetrician-gynecologists to evaluate critically published studies using this research method.
journal_name
Obstet Gynecoljournal_title
Obstetrics and gynecologyauthors
Peipert JF,Grimes DAsubject
Has Abstractpub_date
1994-07-01 00:00:00pages
140-5issue
1eissn
0029-7844issn
1873-233Xjournal_volume
84pub_type
杂志文章,评审abstract：:The management of a patient with an ovarian cyst weighing 71.1 kg is described. Preoperative paracentesis did not improve the condition of the patient and should be avoided. Supine hypotension from vena caval occlusion, technically difficult surgery, massive blood replacement, prolonged postoperative ventilatory failu...
journal_title：Obstetrics and gynecology
pub_type： 杂志文章
doi：
更新日期：1980-08-01 00:00:00
abstract：:A well-woman visit provides an excellent opportunity to counsel patients about maintaining a healthy lifestyle and minimizing health risks. Given the shifting and complex landscape of care, in which many women may not receive all the recommended preventive services, obstetrician-gynecologists have an opportunity to co...
journal_title：Obstetrics and gynecology
pub_type： 杂志文章
doi：10.1097/AOG.0000000000002898
更新日期：2018-10-01 00:00:00
abstract：:The average length of the umbilical cord at delivery is 21 +/- 1 in., but lengths vary from 10 to 50 in. When distended and carrying blood between the fetus and the placenta, the cord is longer; the distended areteries and vein are spiraled about each other. No physiologic data explain the manner by which blood flows ...
journal_title：Obstetrics and gynecology
pub_type： 杂志文章
doi：
更新日期：1978-02-01 00:00:00
abstract：:Despite the use of prophylactic antibiotics, endometritis occurs in 1-31% of patients after cesarean delivery. We sought to identify predictors of prophylactic antibiotic failure. In a retrospective review of 1800 cesarean deliveries, 766 patients had either ampicillin or cefazolin prophylaxis; 240 (31.3%) developed e...
journal_title：Obstetrics and gynecology
pub_type： 杂志文章
doi：
更新日期：1992-07-01 00:00:00
abstract：:In some parts of Dade County, Florida, perinatal mortality rates have revealed serious problems in the delivery of health care to poor pregnant women. From 1982-1985, the reported perinatal mortality rates varied from 32-36 per 1000 live births, more than double the national average. Under the leadership of the Primar...
journal_title：Obstetrics and gynecology
pub_type： 杂志文章,收录出版
doi：
更新日期：1991-09-01 00:00:00
abstract：:The vesicovaginal fistula from prolonged obstructed labor is a condition that is no longer seen in the affluent, industrialized world, yet it continues to exist in epidemic proportions in sub-Saharan Africa, where several million women are estimated to suffer from this condition. The unremitting urinary incontinence t...
journal_title：Obstetrics and gynecology
pub_type： 杂志文章
doi：10.1016/s0029-7844(02)02498-5
更新日期：2002-12-01 00:00:00
abstract：:Preterm birth is the leading cause of neonatal mortality and a substantial portion of all birth-related short- and long-term morbidity. Spontaneous preterm labor is responsible for more than half of preterm births. Its management is the topic of this review. Although there are many maternal characteristics associated ...
journal_title：Obstetrics and gynecology
pub_type： 杂志文章,评审
doi：10.1016/s0029-7844(02)02212-3
更新日期：2002-11-01 00:00:00
abstract：:A gravid patient was given quinidine sulfate for idiopathic ventricular tachycardia. The serum levels of quinidine remained stable throughout pregnancy. At delivery, maternal and neonatal quinidine levels were equivalent, while the level in the amniotic fluid was significantly elevated. Explanations for the latter inc...
journal_title：Obstetrics and gynecology
pub_type： 杂志文章
doi：
更新日期：1979-09-01 00:00:00
abstract：:The authors describe a 5-year experience with 27 patients who had confirmed intrauterine scars at hysteroscopy, all of whom underwent resection of the scar. Of the 27, 14 became pregnant at least once, and 13 did not conceive. Hysteroscopic and hysterographic evidence of intrauterine scar was in general more severe in...
journal_title：Obstetrics and gynecology
pub_type： 杂志文章
doi：
更新日期：1982-07-01 00:00:00
abstract：OBJECTIVE:To evaluate the relationship between the presence of microorganisms at the time of cesarean at different sites of the genital tract and the development of postpartum endometritus. METHODS:One-hundred thirty-three healthy women who delivered by cesarean were enrolled in this prospective study. Cultures were o...
journal_title：Obstetrics and gynecology
pub_type： 临床试验,杂志文章
doi：10.1016/s0029-7844(99)00421-4
更新日期：1999-11-01 00:00:00
abstract：:The relation between bodily build and susceptibility to eclampsia has been controversial for nearly two centuries and the issue has been confused by modern studies of women with nonconvulsive hypertensive disorders in whom the diagnosis of preeclampsia is frequently erroneous. The present study is based upon 193 previ...
journal_title：Obstetrics and gynecology
pub_type： 杂志文章
doi：
更新日期：1984-09-01 00:00:00
abstract：:Fourteen cases of typhoid fever complicating pregnancy are presented. The diagnosis was confirmed by blood cultures in 13 patients and by a rising Widal titer in one. Stool cultures were positive in only two out of five patients; urine cultures in 12 patients and cervical cultures in five patients were all negative. T...
journal_title：Obstetrics and gynecology
pub_type： 杂志文章
doi：
更新日期：1988-05-01 00:00:00
abstract：BACKGROUND:A spontaneous fall in the radioimmunoassay for the beta subunit of hCG to less than 2 mIU/mL documents regression of hydatidiform mole following evacuation of a molar pregnancy. Continued negative hCG levels for the year after evacuation indicates the absence of risk for persistent gestational trophoblastic ...
journal_title：Obstetrics and gynecology
pub_type： 杂志文章
doi：
更新日期：1993-05-01 00:00:00
abstract：:Fetal oxytocin contribution to the mother during spontaneous labor was investigated using a specific and sensitive radioimmunoassay to measure oxytocin in blood, amniotic fluid, and urine. In 26 subjects with spontaneous labor and vaginal delivery (Group I) and 18 subjects with cesarean section after labor (Group II),...
journal_title：Obstetrics and gynecology
pub_type： 杂志文章
doi：
更新日期：1978-08-01 00:00:00
abstract：OBJECTIVE:To evaluate the rate of live birth and the duration of survival after termination of pregnancy without feticide. METHODS:We conducted a retrospective analysis of 241 terminations of pregnancy without feticide for fetal anomalies or genetic abnormalities between 20 0/7 and 24 0/7 weeks of gestation at a singl...
journal_title：Obstetrics and gynecology
pub_type： 杂志文章
doi：10.1097/AOG.0000000000002503
更新日期：2018-03-01 00:00:00
abstract：:This study was undertaken to compare the outcome of pregnancy in patients treated for some type of infertility problem to that of a control group of patients from the same obstetric unit and also to the reported literature. Reported are the primary outcomes of 122 pregnancies in 104 patients treated for infertility an...
journal_title：Obstetrics and gynecology
pub_type： 杂志文章
doi：
更新日期：1977-02-01 00:00:00
abstract：:It has been demonstrated that in selected cases of subfertility in men, the first portion of the split ejaculate is superior to the specimen considered as a whole with regard to sperm density, sperm motility, and sperm morphology and also in those cases where there is increased seminal viscosity in the whole ejaculate...
journal_title：Obstetrics and gynecology
pub_type： 杂志文章
doi：
更新日期：1975-01-01 00:00:00
abstract：OBJECTIVE:To examine whether there are: 1) regional differences in three perinatal interventions that reflect active treatment among periviable gestations and 2) racial-ethnic differences in the receipt of these perinatal interventions after accounting for hospital region. METHODS:We conducted a retrospective study on...
journal_title：Obstetrics and gynecology
pub_type： 杂志文章
doi：10.1097/AOG.0000000000003747
更新日期：2020-04-01 00:00:00
abstract：OBJECTIVE:To estimate the association of the estrogen and progestin potency of combined oral contraceptive pills (OCPs) with epithelial ovarian carcinoma risk. METHODS:This population-based case-control study included 745 women with incident, histologically confirmed epithelial ovarian carcinoma and 943 controls, matc...
journal_title：Obstetrics and gynecology
pub_type： 杂志文章
doi：10.1097/01.AOG.0000255664.48970.e6
更新日期：2007-03-01 00:00:00
abstract：OBJECTIVE:To determine whether high levels of serum alpha-fetoprotein (AFP) predict increased risk of adverse pregnancy outcomes, including preterm birth (before 37 weeks), preterm birth occurring at or before 28 weeks, small for gestational age (SGA) infant, preeclampsia, and placental abnormalities, and to determine ...
journal_title：Obstetrics and gynecology
pub_type： 杂志文章
doi：10.1016/0029-7844(96)00310-9
更新日期：1996-11-01 00:00:00
abstract：:A single-transducer mechanical sector scanner was used to examine the first-trimester fetus. Fifty-six examinations of 31 patients demonstrated an orderly developmental progression of fetal activity beginning with beating of the fetal heart (7 weeks), progressing to fetal trunk movement (8 weeks), and culminating in i...
journal_title：Obstetrics and gynecology
pub_type： 杂志文章
doi：
更新日期：1980-02-01 00:00:00
abstract：:Preterm birth is the leading cause of neonatal mortality and the most common reason for antenatal hospitalization (1-4). In the United States, approximately 12% of all live births occur before term, and preterm labor preceded approximately 50% of these preterm births (5, 6). Although the causes of preterm labor are no...
journal_title：Obstetrics and gynecology
pub_type： 杂志文章
doi：10.1097/AOG.0000000000001260
更新日期：2016-01-01 00:00:00
abstract：:One hundred consecutive cases of hyperplasia of the endometrium were referred to the Sloane Hospital for Women. The referral diagnoses and consultation diagnoses were compared for the purpose of analyzing common diagnostic problems in interpretation of endometrial hyperplasias and the use of diagnostic terminology as ...
journal_title：Obstetrics and gynecology
pub_type： 杂志文章
doi：
更新日期：1984-08-01 00:00:00
abstract：:A well-developed corpus luteum was found at autopsy in a premature infant who died 26 hours post partum. Intrauterine pituitary-gonadal development and regulation are briefly reviewed and a possible mechanism of intrauterine fetal ovulation is presented. ...
journal_title：Obstetrics and gynecology
pub_type： 杂志文章
doi：
更新日期：1983-04-01 00:00:00
abstract：:Accurately defining a patient's risk of developing breast cancer is a challenging endeavor. Many factors have been implicated in the causation of breast cancer and quantifying them is difficult. Risk stratification is performed using population models, such as the Gail model, as well as the patient's personal and fami...
journal_title：Obstetrics and gynecology
pub_type： 杂志文章,评审
doi：10.1097/01.AOG.0000295638.83285.97
更新日期：2007-12-01 00:00:00
abstract：OBJECTIVE:To examine differences in clinical and pathologic characteristics between women undergoing hysterectomy who had had prior tubal sterilization and those who had not. METHODS:One thousand eight hundred fifty-one women undergoing hysterectomy were enrolled as part of a multicenter, prospective cohort study. We ...
journal_title：Obstetrics and gynecology
pub_type： 临床试验,杂志文章,多中心研究
doi：10.1016/0029-7844(96)00149-4
更新日期：1996-08-01 00:00:00
abstract：:Infertility is a disease that affects up to 15.5% of reproductive-aged couples. Until the birth of the first neonate born from in vitro fertilization (IVF) in 1978, many infertile couples did not have an opportunity to conceive a biological child. Over the past 40 years, access to and effectiveness of IVF have increas...
journal_title：Obstetrics and gynecology
pub_type： 杂志文章,评审
doi：10.1097/AOG.0000000000002786
更新日期：2018-09-01 00:00:00
abstract：OBJECTIVE:We sought to examine the costs of transferring one through five embryos per in vitro fertilization cycle from each of three perspectives: society, the infertile couple, and the insurer. METHODS:Data from the 2003 Assisted Reproductive Technology Report was used to create Markov decision analytic models strat...
journal_title：Obstetrics and gynecology
pub_type： 杂志文章
doi：10.1097/01.AOG.0000230534.54078.b3
更新日期：2006-09-01 00:00:00
abstract：:Three cases of mucinous carcinoma of the endometrium are presented. These can be distinguished anatomically from endocervical carcinomas and histochemically from endometrial clear cell carcinomas. Clinically these patients do not differ significantly from others with endometrial carcinoma, but the tumors produce large...
journal_title：Obstetrics and gynecology
pub_type： 杂志文章
doi：
更新日期：1980-02-01 00:00:00
abstract：OBJECTIVE:We sought to investigate the prevalence and risk factors for vaginal yeast colonization over a 1-year period. METHODS:We conducted a longitudinal cohort study of 1,248 asymptomatic young women by collecting demographic and behavioral data at baseline, 4, 8, and 12 months. RESULTS:Seventy percent of women we...
journal_title：Obstetrics and gynecology
pub_type： 杂志文章
doi：10.1097/01.AOG.0000140687.51048.73
更新日期：2004-11-01 00:00:00
