Obstetrics & Gynecology:
Factors Associated With Undergoing Bilateral Salpingo-oophorectomy at the Time of Hysterectomy for Benign Conditions
Jacoby, Vanessa L. MD, MAS1; Vittinghoff, Eric PhD2; Nakagawa, Sanae MA1; Jackson, Rebecca MD1,2; Richter, Holly E. PhD, MD3; Chan, John MD1; Kuppermann, Miriam PhD, MPH1,2
From the Departments of 1Obstetrics, Gynecology, and Reproductive Sciences and 2Epidemiology and Biostatistics, University of California, San Francisco, San Francisco, California; and 3Department of Obstetrics and Gynecology, University of Alabama, Birmingham, Alabama.
Dr. Jacoby is supported by the Women’s Reproductive Health Research Career Development Program (Grant K12 HD001262).
Corresponding author: Vanessa L. Jacoby, 1635 Divisadero Street, Suite 600, San Francisco, CA, 94115; e-mail: firstname.lastname@example.org.
Financial Disclosure: The authors did not report any potential conflicts of interest.
OBJECTIVE: To identify possible factors associated with undergoing bilateral salpingo-oophorectomy (BSO) at the time of hysterectomy among women with benign conditions.
METHODS: This was a cross-sectional analysis using the 2005 Nationwide Inpatient Sample. Women aged 18 years or older who underwent hysterectomy with BSO or hysterectomy only for a benign condition were included. We examined a broad range of factors associated with undergoing BSO in multivariable analyses.
RESULTS: Fifty-two percent of 461,321 hysterectomies included BSO, with a mean age of 49 years compared with 43 years in the hysterectomy-only group (P<.001). The odds of BSO were two times higher in the Midwest and South and 1.67 times higher in the West as compared with the Northeast (P<.001). Women who were uninsured or had Medicaid were more likely to undergo BSO compared with those with private insurance (odds ratio 1.86, 95% confidence interval 1.14–3.04 for “no charge/charity,” odds ratio 1.21, 95% confidence interval 1.08–1.35 for Medicaid) Although BSO was more common among white women than African-American, Latina, and Asian women (P<.001), lower income was associated with BSO among African-American and white women only, not among Asian and Latina women (P=.007 for test for interaction). BSO was eight times as likely with a laparoscopic hysterectomy and 12 times as likely with an abdominal hysterectomy compared with a vaginal approach (P<.001). Women who had endometriosis, pelvic infection, or an ovarian cyst were more likely to undergo BSO (P<.001) compared with women who did not have these diagnoses.
CONCLUSION: There is significant nationwide variation in the practice of BSO. Age, route of hysterectomy, and diagnosis at surgery affect BSO rates. Nonclinical factors such as race or ethnicity, insurance status, income, and geographic location are also associated with BSO practice.
LEVEL OF EVIDENCE: II
Hysterectomy is the most common major surgery among nonpregnant women in the United States, with more than 600,000 cases per year.1,2 Elective bilateral salpingo-oophorectomy (BSO) is routinely offered to women at the time of hysterectomy as a prophylactic procedure to prevent ovarian cancer and future surgery for benign ovarian masses and as treatment for pelvic pain, premenstrual syndrome, or symptomatic endometriosis.3–7 However, the permanent loss of endogenous ovarian hormones due to BSO has been postulated to adversely affect a diverse range of health outcomes. The current literature precludes a definitive recommendation for performing elective BSO due to conflicting results for the risk of coronary heart disease,8–14 osteoporotic fractures,15,16 sexual functioning, and mental health after BSO.17–21
Bilateral salpingo-oophorectomy is common, with a rate of 54% for all hysterectomies from 2000–2004.2 Age at the time of hysterectomy influences BSO rates; among women aged 50–54 years, 78% underwent BSO compared with 37% of women aged 15–44 years.2 Route of hysterectomy is also associated with BSO; higher rates have been reported among women who undergo abdominal hysterectomy compared with vaginal hysterectomy.2,22 However, besides age and surgical approach, patient and provider characteristics that determine the practice of elective BSO are largely unknown.
Given the high rate of BSO and the potential effect of this surgery on a wide range of health outcomes, understanding practice patterns is critical. Our aim is to evaluate possible demographic, clinical, and health system factors associated with undergoing elective BSO at the time of hysterectomy in a nationwide sample of women. Our results will inform surgical practice guidelines and provide a foundation for future research on the risks and benefits of this common surgical procedure.
MATERIALS AND METHODS
This was a cross-sectional analysis of the 2005 Nationwide Inpatient Sample (NIS), a national database sponsored by the Agency for Healthcare Research and Quality. The NIS is a 20% stratified random sample of discharges from all community hospitals in the United States. Hospitals considered for sampling include nonfederal, general, and specialty short-term hospitals, including public and academic facilities. The sampling scheme of the NIS represents approximately 90% of all hospitals. It is the largest all-payer database of hospital discharges, with 8 million hospital stays in the 2005 NIS from 37 states.
Each record in the NIS contains a maximum of 15 procedure codes and 15 diagnostic codes classified using both the International Classification of Disease, 9th Revision, Clinical Modification (ICD-9-CM) and the Clinical Classification Software developed by the Agency for Healthcare Research and Quality. The Clinical Classification Software is a categorization scheme that collapses ICD-9 codes into clinically meaningful categories that are useful for descriptive analysis.
All women aged 18 years or older who underwent hysterectomy by any surgical approach were identified with ICD-9-CM procedure codes 68.31 or 68.39 for subtotal hysterectomies, 684.1 or 684.9 for total hysterectomies, and 68.51 or 68.59 for vaginal hysterectomies. Women were excluded with ICD-9-CM procedure codes for cesarean delivery with concomitant hysterectomy or with any ICD-9-CM code or Clinical Classification Software code for cancer of the gynecologic, gastrointestinal, or genitourinary tract, lymphoma, or malignant neoplasm without specification of site.
The selected cohort of women undergoing hysterectomy for benign indications was then classified into a group labeled “BSO” that underwent concomitant bilateral salpingo-oophorectomy (ICD-9-CM codes 65.61 or 65.63) or bilateral oophorectomy (ICD-9-CM codes 65.51 or 65.53) compared with a group labeled “hysterectomy only” that underwent hysterectomy alone without adnexal surgery. Women who underwent unilateral salpingo-oophorectomy or unilateral oophorectomy were excluded from the analysis.
Predictor variables were classified as demographic (age, race or ethnicity, income, region of the country, rural or urban hospital setting), clinical (hysterectomy approach, surgical diagnosis), or health system (primary payer, hospital number of beds, hospital teaching status). Data on age, race or ethnicity, income, region, and hospital setting were derived from predefined NIS categories. In the NIS, the hospital setting is based on Core Based Statistical Area codes defined by the Office of Management and Budget using data from the 2000 Census. Hospitals with a Core Based Statistical Area type Metropolitan (an urban area with at least 50,000 people) or Division were used to define “urban” and Micropolitan (urban area with 10,000–50,000 people) or Rural were used to define “rural.” Primary expected payer and hospital size and teaching status were also extrapolated from available NIS categorical variables. The seven categories for surgical diagnosis were constructed using the following codes: 1) leiomyomas: ICD-9-CM codes 21.80, 21.81, 21.82, or 21.89; 2) endometriosis: clinical classification software code 169; 3) pelvic infection: ICD-9-CM codes 61.40–61.49, 61.50, 61.51, 61.59, 61.610, 61.611, or 61.62–61.65; 4) prolapse: ICD-9-CM codes 61.800–61.805, 61.809, 61.81–61.84, 61.86–61.88, 61.881–61.883, 61.889, or 61.89; 5) abnormal bleeding: ICD-9-CM codes 62.60–62.66, 62.68–62.71, or 62.67; 6) pelvic pain: ICD-9-CM diagnosis codes 62.50, or 62.52–62.55; 7) ovarian cyst: ICD-9-CM codes 62.00–62.02 for a diagnosis of follicular cyst, corpus luteum cyst, or unspecified ovarian cyst. Each patient had a maximum of 15 diagnosis codes listed at the time of surgery, and these codes were not treated as mutually exclusive in our analysis, because many patients have multiple indications for undergoing hysterectomy. Each indication was represented in the model by a separate indicator variable. The resulting odds ratio for each indication can be interpreted as the odds of undergoing BSO for women with that diagnosis compared with women without that diagnosis, holding all other indications as well as other covariates constant.
To account for the sampling design of the NIS, special survey procedures were used in SAS 9.12 (SAS Institute Inc., Cary, NC). Thus all analyses use the inverse probability of selection weights provided in the data set, and account for stratification of the sample by geographic region, type of control (public, not-for-profit, proprietary), location (urban or rural), teaching status, and bed size (small, medium, large). The analyses also account for clustering of patient outcomes within hospitals, the primary sampling units. The subgroup and overall totals we present reflect the inverse probability weights, and thus can be interpreted as estimates of totals in the target population.
Logistic regression was used to assess the independent associations of demographic, clinical, or health system factors, with undergoing a BSO at the time of hysterectomy compared with hysterectomy only. Predictors were selected a priori on substantive grounds. All were included in the multivariable model to avoid inflation of the type I error rate potentially induced by model selection. The very large NIS sample accommodates this large number of predictors. We hypothesized that the effect of income might vary by race or ethnicity, and formal tests for interaction strongly supported this hypothesis. Thus, results for other predictors are adjusted for the main effects as well as the interaction of race or ethnicity and income. For clarity, we use bar plots to describe the adjusted effects of income on BSO among white, African-American, Latina, and Asian women, as well as the adjusted effects of race or ethnicity stratified by income.
We also hypothesized that a broader range of factors might be differentially associated with BSO among younger women undergoing hysterectomy at age 40–49 years for leiomyomas, abnormal bleeding, pelvic pain, endometriosis, or prolapse. This is the most common age range to undergo hysterectomy and the subgroup in which the decision to undergo elective BSO is most controversial. Accordingly, the analysis was repeated within this subgroup, including the test for interaction of income and race or ethnicity.
The primary analysis was restricted to the 310,552 (67%) women who underwent hysterectomy with BSO or hysterectomy only who had complete data on all predictors included in the model. To check for the potential influence of the many observations with missing race or ethnicity (28%), we also performed a sensitivity analysis in which the missing values for these two predictors were treated as separate categories, so that the women with missing values could be included in the analysis.
In the 2005 Nationwide Inpatient Sample, there were 519,211 women aged 18 years or older who underwent hysterectomy for a benign gynecologic condition. Overall, 46% of these women had a concomitant BSO, and 11% underwent unilateral oophorectomy. Table 1 demonstrates the characteristics of the 461,321 women in our primary analysis who underwent either a hysterectomy with BSO or a hysterectomy and no adnexal surgery (“hysterectomy only”) for a benign condition. Among these women, 52% of hysterectomies included BSO, with a mean age of 49 years compared with 43 years in the hysterectomy only group (P<.001). The majority of women were white (72%) and had private health insurance (74%). The greatest number of hysterectomies occurred in the South (40%), with the lowest number in the Northeast (16%). Abdominal hysterectomy was the most common approach to surgery in both the BSO (76%) and hysterectomy only groups (49%). Overall, abnormal bleeding and leiomyomas were the most common indications for surgery, with or without BSO.
Several demographic factors were significant independent predictors of undergoing a BSO at the time of hysterectomy (Table 2). Age was a strong predictor of BSO; 63% of women aged 45–49 years underwent BSO compared with 30% aged 35–39 years. Women in the South and Midwest were approximately twice as likely to undergo BSO compared with women in the Northeast. Bilateral salpingo-oophorectomy rates were similar in rural and urban hospital settings.
Hysterectomy route and indication for surgery were also significant predictors of BSO (Table 2). Vaginal hysterectomy had the lowest BSO rate at 21% compared with 55% of laparoscopic hysterectomies and 63% of abdominal hysterectomies. Women with endometriosis, pelvic infection, or an ovarian cyst were significantly more likely to undergo BSO compared with women who did not have these diagnoses. The odds of BSO were lower among women with a diagnosis of leiomyomas, abnormal bleeding, or prolapse.
Health insurance status was associated with the likelihood of undergoing BSO (Table 2). Compared with women with private insurance, women with Medicaid and those without any insurance (“no charge/charity” or self-pay) were more likely to undergo BSO, whereas women with Medicare were less likely. Teaching status or number of beds in the hospital were not associated with BSO.
There was a significant interaction in the multivariable model between race or ethnicity and income (P=.007 for test for interaction) (Fig. 1). Among white and African-American women, lower income was a strong predictor of BSO. However, for Latina and Asian women, BSO rates were similar across income levels. In all income levels, nonwhite women had significantly lower rates of BSO compared with white women.
In a subgroup analysis of women aged 40–49 years who underwent hysterectomy for leiomyomas, endometriosis, prolapse, abnormal bleeding, or pelvic pain, predictors of BSO were nearly identical, both qualitatively and quantitatively, to those in the full cohort of women (data not shown). For each year of increasing age, the odds of BSO increased by 30% (odds ratio [OR] 1.30, 95% confidence interval [CI] 1.28–1.32). As in the larger cohort, women in the Northeast had statistically significant lower odds of BSO compared with all other regions (Midwest OR 2.37, 95% CI 1.87–3.00, South OR 2.47, 95% CI 1.99–3.05, West OR 2.13, 95% CI 1.77–2.66). Women with Medicaid or those who were uninsured had significantly higher rates of BSO compared with women with private insurance (Medicaid OR 1.45, 95% CI 1.23–1.70, no charge/charity OR 2.28, 95% CI 1.27–4.11). The interaction term for race or ethnicity and income was not statistically significant in this subgroup. Women in all three income levels less than $61,000 were more likely to undergo BSO, with OR 1.29–1.73 (P<.001). Consistent with findings in the larger cohort, African-American and Latina women were less likely to undergo BSO compared with white women (African American OR 0.6, 95% CI 0.53–0.69, Latina OR 0.49, 95% CI 0.43–0.57). Hospital teaching status, number of beds, or rural setting did not effect the likelihood of BSO.
In the sensitivity analyses treating missing values of race or ethnicity as a separate category, results did not differ meaningfully from the results of the main analyses, which were conducted excluding these observations (data not shown).
In this large cross-sectional analysis of more than 400,000 women who underwent hysterectomy, we identified several independent predictors of undergoing concomitant BSO. Age, route of hysterectomy, and the indication for hysterectomy were expected to influence BSO rates because they are routinely included in preoperative counseling and have been reported in previous studies.22–28 However, variation by race or ethnicity, income, insurance status, and geographic region indicate BSO practice variation is in part influenced by nonclinical factors.
Age at the time of hysterectomy was a strong predictor of undergoing BSO in our study. Bilateral salpingo-oophorectomy is least common in women aged younger than 40 years because of the potential adverse consequences of a significantly premature surgical menopause. Several survey studies of gynecologists have found patient age to be a primary influence in the decision of whether to recommend BSO.23–25,29,30 Recent guidelines from the American College of Obstetricians and Gynecologists confirmed this approach to BSO by stating premenopausal status should favor ovarian preservation and postmenopausal status should favor BSO.31 However, we found BSO is still a common procedure in premenopausal women, accompanying hysterectomy for benign conditions in 40% of women aged 40–44 years and 63% of women aged 45–49 years. Given that the American College of Obstetricians and Gynecologists guidelines are based on Level C evidence and the literature on adverse outcomes of BSO is inconclusive, these rates of BSO likely reflect uncertainty regarding the risk/benefit ratio of BSO for premenopausal women. The majority of postmenopausal women underwent BSO (78% in age 50–54 years, 68% in age older than 55 years), because the ovaries are generally not considered productive endocrine organs in this age range. However, several studies have demonstrated continued production of estrogen and testosterone in postmenopausal women and these hormones may be associated with sexual functioning in older women.32–34 The potential lasting benefit of continued ovarian hormone production, however small, may explain why some women and providers elect ovarian conservation in this age range.
Bilateral salpingo-oophorectomy rates varied substantially by race or ethnicity, with significantly lower rates of BSO among all racial and ethnic groups compared with white women. Disparities in overall hysterectomy rates have previously been reported, with Latina women generally showing lower rates of hysterectomy and African-American women demonstrating higher rates compared with white women.35,36 However, these surgical trends are not consistent with the overall low BSO rates in nonwhite groups. One factor that may influence racial or ethnic differences in BSO is that African-American women have a lower rate of hormone use, and physicians are less likely to recommend hormone to African-American women compared with white women.37,38 Among premenopausal women, use of estrogen after BSO is frequently used to control menopausal symptoms, so that a desire, or physician recommendation, to avoid hormone use may influence the decision to undergo BSO. We were unable to determine whether racial or ethnic differences in BSO represent distinct patient preferences or a differential influence of physicians on BSO practice by race or ethnicity. Further investigation is needed to examine the cause of this difference in surgical practice.
Lower income was associated with higher rates of BSO among white and African-American women, but not among Latinas and Asians in the primary analysis. This interaction may be due to actual differences by income in provider or patient preference for BSO among white and African-American women that are weaker or absent among Latina and Asian women. Alternatively, lack of English proficiency could blunt the effect of lower income among Latina and Asian women. For instance, English language proficiency among Latina patients has been shown to affect participation in medical care decision-making and access to health services.39,40
In our multivariable model, women with Medicaid or no health insurance were more likely to undergo BSO compared with women with private health insurance. Medicaid reimbursement rates for BSO at the time of hysterectomy vary by surgical approach. For abdominal and vaginal hysterectomy, there is no increased reimbursement for a concomitant BSO, but for laparoscopic-assisted vaginal hysterectomy or laparoscopic hysterectomy, BSO increases payment by $30–77. Given that only 14% of hysterectomies occurred by laparoscopy, differences in BSO by payer type are unlikely due to financial incentives. Rather, the differences in BSO practice may reflect an increased patient desire or greater likelihood of physician recommendation to perform BSO to prevent the need for additional ovarian surgery and its associated costs among women at high risk for being uninsured in the future.
There are several limitations to our analysis. The Nationwide Inpatient Sample is a large database that receives input from 32 state databases. Therefore, errors in coding and classification of all predictor variables are possible. The data set does not provide some patient characteristics that may influence the decision to undergo BSO, such as family history of breast or ovarian cancer, or a history of cardiovascular disease or osteoporosis. However, we do not believe that the addition of these factors in our multivariable model would alter our findings, because these are rare conditions in women aged 40–54 years, the majority of our study population. Finally, race or ethnicity was missing for 28% of our study population, which may have introduced bias in our complete-case analysis. However, our regression models that included women with missing data for race or ethnicity did not differ substantially from the primary models.
In this large, nationwide analysis of women who underwent hysterectomy for benign conditions, we identified several unique factors associated with undergoing a concomitant BSO. Although previous studies have reported overall BSO rates and temporal trends in the rate of BSO,2,41,42 the diverse range of factors that influence national BSO practice have not been examined. It is unclear whether patients or providers are the primary influence in the BSO practice variations we identified. In the NIS, we were unable to assess physician characteristics such as age, years in practice, or subspecialty training that may influence patient counseling on whether to undergo BSO. Survey studies of gynecologists have found that patient age, surgical route, specialty area, and physician gender influence BSO recommendations.23–28,30 Few studies have assessed patient preference for BSO; one study reported that women consider the risk of ovarian cancer, use of hormone therapy, and the therapeutic effects of BSO on pain in making the BSO decision,43 whereas another found that personality traits, sexual functioning, and preoperative symptoms all affect BSO decisions.44 However, none of these studies examined nonclinical factors such as race or ethnicity, income, and insurance status that we identified as significant predictors of BSO. Further research is needed to elucidate the cause of these differences in BSO practice and determine the overall health effect of these practice variations.
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© 2009 by The American College of Obstetricians and Gynecologists.
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