High cumulative incidence of uterine leiomyoma in black and white women: Ultrasound evidence

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Variation in the incidence of uterine leiomyoma among premenopausal women by age and race.

Brandon Marshall, Mildred M. Goldman, J Manson … (1997)

To quantify the incidence of uterine leiomyoma confirmed by hysterectomy, ultrasound, or pelvic examination according to age and race among premenopausal women. From September 1989 through May 1993, 95,061 premenopausal nurses age 25-44 with intact uteri and no history of uterine leiomyoma were followed to determine incidence rates of uterine leiomyoma. The self-reported diagnosis was confirmed in 93% of the medical records obtained for a sample of cases. Using pooled logistic regression, we estimated relative risks (RRs) of uterine leiomyoma according to race and examined whether adjustment for other potential risk factors could explain the variation in the race-specific rates. During 327,065 woman-years, 4181 new cases of uterine leiomyoma were reported. The incidence rates increased with age, and the age-standardized rates of ultrasound- or hysterectomy-confirmed diagnoses per 1000 woman-years were 8.9 among white women and 30.6 among black women. After further adjustment for marital status, body mass index, age at first birth, years since last birth, history of infertility, age at first oral contraceptive use, and current alcohol consumption, the rates among black women were significantly greater for diagnoses confirmed by ultrasound or hysterectomy (RR 3.25; 95% confidence interval [CI] 2.71, 3.88) and by hysterectomy (RR 1.82; 95% CI 1.17, 2.82) compared with rates among white women. We observed similar RRs when the cohort was restricted to participants who reported undergoing a screening physical examination within the 2 years before baseline. A higher prevalence of known risk factors did not explain the excess rate of uterine leiomyoma among premenopausal black women.

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The frequency of uterine leiomyomas.

Karina S. Cramer, Dhyanesh Patel (1990)

As a leading cause of hysterectomy in premenopausal women. uterine leiomyomas are a major public health problem. However, very little work has been done on their epidemiology. Indeed, their true frequency has never been established using systematic and meticulous methods. In this study, gross serial sectioning at 2-mm intervals was applied as an adjunct to routine pathology processing in 100 consecutive total hysterectomy specimens. This tripled the number of leiomyomas noted in routine pathology reports. There were 649 leiomyomas in 77 of 100 uteri, with multiplicity of leiomyomas in 84%. Although leiomyomas were more numerous and larger in women with a clinical diagnosis of myomatous uterus, the incidence was no higher than in uteri removed for other reasons. The postmenopausal incidence of leiomyomas was no lower than the premenopausal incidence, although postmenopausal leiomyomas were smaller and fewer. These findings suggest that epidemiologic studies of leiomyomas may not be valid if they are based only on clinical diagnoses or routine pathology reports.

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Hysterectomy in the United States, 1988-1990.

Sarah Peterson, Alexandra L. Strauss, Lisa M. Koonin … (1994)

To describe patient characteristics and diagnoses associated with hysterectomy in the United States from 1988-1990 using data from the National Hospital Discharge Survey. We analyzed data from the National Hospital Discharge Survey, an annual probability sample of discharges from nonfederal, short-stay hospitals in the United States. A population-based sample of all women aged 15 years or older in the United States civilian population who had a hysterectomy during 1988-1990 was examined to characterize factors associated with hysterectomy: patients' age and race, diagnoses, surgical approach, and oophorectomy. Approximately 1.7 million women had a hysterectomy during 1988-1990. The highest rates--100.5 hysterectomies per 10,000 women--were for women aged 30-54 years. Total rates of hysterectomy for black women were similar to those for white women (61.7 and 56.5 per 10,000 women, respectively); uterine leiomyoma ("fibroid tumor") was reported as the primary diagnosis for 61% of black women and 29% of white women. Abdominal surgery was used for 75% of all hysterectomies. Concomitant bilateral oophorectomy was done for 37% of the women under 45 years old and 68% of the women 45 years or older. Two-thirds of all hysterectomies for noncancerous conditions were performed for uterine leiomyoma or endometriosis--conditions that are most common before the age of menopause. Future assessments of the appropriateness of hysterectomy will require better understanding of these disorders. Continued monitoring of hysterectomy rates is critical to understanding the appropriate use of hysterectomy, alternative therapies for uterine disorders, and future trends in women's health care.