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Research ArticleOriginal Research

Prostate-Specific Antigen Testing among the Elderly in Community-Based Family Medicine Practices

Shawna V. Hudson, Pamela Ohman-Strickland, Jeanne M. Ferrante, Grace Lu-Yao, A. John Orzano and Benjamin F. Crabtree
The Journal of the American Board of Family Medicine May 2009, 22 (3) 257-265; DOI: https://doi.org/10.3122/jabfm.2009.03.080136
Shawna V. Hudson
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Pamela Ohman-Strickland
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Jeanne M. Ferrante
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Grace Lu-Yao
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A. John Orzano
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Benjamin F. Crabtree
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Abstract

Background: Controversy surrounds prostate-specific antigen (PSA) testing for prostate cancer screening, especially among elderly men aged 75 and older. This study examines whether patient age results in differential use of PSA testing and if organizational attributes such as communication, stress, decision making, and practice history of change predict PSA testing among men aged 75 and older.

Methods: Data came from chart audits of 1149 men ≥50 years old who were patients of 46 family medicine practices participating in 2 northeastern practice-based research networks. Surveys administered to clinicians and staff in each practice provide practice-level data. A stratified Cochran-Mantel-Haenszel test was applied to examine whether PSA testing decreased with age. Hierarchical logistic regression analyses determined characteristics associated with PSA testing for men ≥75 years old.

Results: Comparable rates for annual PSA testing of 77.2% for men aged 50 to 74 years and 74.6% for men ≥75 years old were reported. The Cochran-Mantel-Haenszel test indicated no significant change in trend. Hierarchical models suggest that practice communication is the only organizational attribute that influences PSA testing for men 75 years of age or older (odds ratio, 5.04; P = .022). Practices with higher communication scores (eg, promoted constructive work relationships and a team atmosphere between staff and clinicians) screened men aged 75 and older at lower rates than others.

Conclusions: Elderly men in community settings receive PSA testing at rates comparable to their younger counterparts even though major clinical practice guidelines discourage the practice for this population. Intraoffice practice interventions that target PSA testing to the most appropriate populations and focus on communication (both within the office and with patients) are needed.

Prostate cancer is the leading cause of new cancer cases and the second leading cause of cancer death among men in the United States. One in 6 American men will be diagnosed with prostate cancer during their lifetime.1 In 2007 there were an estimated 218,890 new cases and 27,050 deaths from prostate cancer.1 Controversy surrounds prostate cancer screening (ie, prostate-specific antigen [PSA] testing in conjunction with digital rectal examination [DRE]) because of a lack of definitive evidence about its effectiveness in improving clinical outcomes and reducing mortality.2,3 The US Preventive Services Task Force (USPSTF) does not recommend for or against prostate cancer screening; the American College of Physicians and the American College of Preventive Medicine endorse individualizing the decision to screen, whereas the American Cancer Society and the American Urological Association recommend offering the PSA test in conjunction with DREs annually beginning at age 50 to men who have a further life expectancy of at least 10 years.4–8

Surveys of primary care physicians suggest that PSA testing is routine practice for many.9–15 Patient surveys show prostate cancer screening to be fairly common16 (more common than colorectal cancer screening,3,17 for which there are evidence-based screening recommendations). Published chart review studies conducted in primary care practices reported PSA testing rates of 25% to 40% in the 1990s.18,19 PSA testing was associated with patient factors (>59 years old, nonsmoking status, having private insurance, race) and physician factors (older physicians were more likely to screen, being in a practice with multiple physicians, readiness to change cancer screening behavior).10,18–20 A study using 2000 National Health Interview Survey data found the majority of PSA test recipients were nonHispanic white men aged 50 to 69 with relatively high levels of education, income, access to health care, and general health.16

Older patient age is also associated with PSA testing,18 yet there are few data that support clinical decisions to test men over the age of 75.21–23 There are a number of concerns related to testing in this group.24 First, PSA tests cannot distinguish lethal versus nonlethal prostate cancer24,25; therefore, it is unclear who is likely to benefit from treatment. Second, although treatment with radical prostatectomy has recently been associated with moderate mortality reduction,26–28 it is unclear whether treatment results in significant increases in lifespan7,8 or quality of life.21,23,29 Therefore, there are a number of questions about the cost-benefit associated with testing and treatment that have led the USPSTF to issue a D (“do not screen”) recommendation for men aged 75 and older.24

Nevertheless, several recent studies have found that men aged 75 and older routinely receive screening.30–32 Studies using physician-reported data from the 1999 to 2002 National Ambulatory Medical Care Survey reports PSA testing to be approximately 28% in men older than 75.32 One retrospective study of PSA testing in 7 New England Veteran Health Administration hospitals found a rate of 18% for men 75 years of age or older.30 Another study of outpatient visits in the 104 hospitals overseen by the US Department of Veterans’ Affairs found decreasing rates of testing, starting with 56% for men ages 75 to 79, 43% for men ages 80 to 84, and 36% for men ≥85 years old.31

Studies documenting self-reported PSA testing report comparable rates. Lu-Yao et al21 report PSA testing rates of 39% for men aged 75 to 79 and 24% for men ≥80 years old in 2000 based on the National Health Interview Survey. Further, the authors indicated that approximately one-third of PSA tests were initiated for diagnostic purposes and that these tests were not included in the calculation of screening rates. Thus, it can be inferred that approximately two-thirds of PSA tests occurred for preventive prostate cancer screening. Several studies have suggested that PSA testing might be overused among elderly men21,31 and results in overdiagnosis.33 For example, among men aged 85 years and older, 34% in the best health had a PSA test compared with 36% in the worst health in a Veterans’ Affairs study.31

Much of the existing literature on this topic come from data generated in private health care settings that serve a fraction of the American public. There is no published data on PSA testing in community-based primary care settings where the bulk of patients receive their care. In addition, there are no studies that examine how practice characteristics or organizational climate are associated with PSA testing. However, there is a substantial literature that suggests that office characteristics such as office practice structure34–37 and competing demands38–40 are associated with the delivery of preventive services34,35,41–45 and cancer screening.34–37 The purpose of this study was to provide an updated examination of PSA testing in community-based family medicine practices and to assess whether organizational factors are associated with PSA testing in elderly men ≥75 years of age.

Methods

This study is based on a secondary analysis of data collected in a study of chronic disease management. We used cross-sectional data collected at baseline, from April 2003 through December 2004, from the quality improvement intervention study “Using Learning Teams for Reflective Adaptation”(ULTRA). The ULTRA study used a multimethod assessment process46 to inform a facilitated team-building intervention47 aimed at improving guideline adherence for multiple chronic diseases among 55 practices in New Jersey and Pennsylvania. Detailed information about sample recruitment has been previously published.48,49 This study focuses on 46 nonresidency community-based practices. The University of Medicine and Dentistry of New Jersey/Robert Wood Johnson Medical School Institutional Review Board approved this study.

Data Collection

Clinical outcome data were collected from medical records. Each participating practice generated lists of patients seen in their office during the previous 12 months based on billing codes for asthma, coronary artery disease, diabetes, and hypertension, as well as a list of current patients seen for any reason. Within each practice, 20 patients were randomly selected from each list. All patients were used when there were fewer than 20 patients per diagnosis code. For all male patients, nurse chart auditors from the research team noted the dates of PSA testing as well as age and other patient information. This analysis focused only on men included in the chart review who were at least 50 years of age (n = 1149).

In addition to the medical record review, practice managers and lead physicians completed a 46-item practice information form that solicited information about topics such as patient population (eg, payer mix, race/ethnicity); staff turnover; the use of clinical reminder and prevention systems; and implementation of electronic medical records. Practice employees (clinicians, nursing staff, and office staff) also completed a self-administered practice climate survey that included the Survey of Organizational Attributes for Primary Care (SOAPC).50 This survey took approximately 15 to 20 minutes to complete and responses were kept confidential. Surveys were distributed once and a replacement survey was provided 1 month later to nonresponders. Of 46 nonresidency practices, 28 practices had at least a 65% response rate among the practice staff and were used in the following analyses, which examine relationships between PSA testing patterns and organizational characteristics.

A total of 755 practice members were surveyed across the 28 practices. We examined multiple characteristics of nonresponders and responders for differences that may bias our findings. Nonresponders were similar to responders in terms of gender, years employed in the practice, and staff roles (ie, physicians versus nonphysicians and clinical versus office staff). There was a difference, however, in number of hours worked per week (χ2 = 7.10; P = .0077). Part-time employees were less likely to respond than full-time employees (57% vs 68%, respectively). At the practice level, we examined practices excluded from the analysis because of the 65% cutoff and found no significant differences in a number of traits between those and the ones included in the analysis, including ownership (physicians versus other); type of practice (solo, single specialty group, and multispecialty group); and years under current ownership.

Outcomes

PSA testing was the primary outcome. Dates for the most recent PSA values and patients’ last visits to the practice were recorded to determine whether testing occurred within the past 1, 2, or 5 years.

Sociodemographic Correlates

Sociodemographic variables considered included patient age; the number of visits within the last 2 years; the number of major comorbid conditions (including diabetes, asthma, hypertension, or a heart condition); and whether the patient had received cholesterol screening during the past year. Cholesterol screening was used to determine whether the PSA testing was occurring as part of a standard panel of tests. In addition, a number of practice level demographics were assessed, including practice size; the average number of years the practices had been in existence; and practice estimates of payer mix, race/ethnicity of the patient population, and office volume measured as the proportion of patient offices visits per physician clinician.

Organizational Factors

Organizational factors of interest in this study were assessed using the SOAPC,50 a validated instrument that examines practice organization in the primary care setting. Clinicians and staff members were asked to describe their level of agreement (1 = strongly disagree, 5 = strongly agree) with a series of statements designed to measure practice communication, decision-making models, stress, and the practice's history of change.50 The communications scale included 4 items (α = 0.81) such as, “The staff and clinicians in this practice operate as a real team.” This scale describes whether all members of the practice are able to work through problems as a team through discussion and consultation with one another.50 The decision-making scale included 8 items (α = 0.88) such as, “The practice encourages staff input for making changes and improvements.” The stress scale comprised 6 items (α = 0.85) including “It's hard to make any changes in this practice because we're so busy seeing patients.” History of change was measured by 3 items (α = 0.73) including, “Our practice has changed in how everyone relates.” High scores for these scales indicate better communication and decision-making practices that encourage input from all employees, a stressful/overwhelming workload, and numerous changes in the management and culture of the practice.50 Measures were constructed for practices that achieved a response rate of a 65% or higher.

Analyses

Descriptive statistics were calculated for patients and practices. Frequencies for categorical variables and means and standard deviations for continuous variables were reported.

Each patient in the study was classified according to whether they had received PSA testing within the last 1, 2, or 5 years. To examine the relationship between age and testing, initial tables compared age group (5-year increments from 50 to 90 and at least 90) to whether PSA testing was conducted. A stratified Cochran-Mantel-Haenszel (CMH) test was applied to test for a decreasing trend in the rate of PSA testing for increasing ages in which the table was stratified with respect to practice membership.

Hierarchical logistic regression models examined whether particular practice or patient characteristics were associated with differential rates of PSA testing among those aged 75 years or older. Within these analyses, a binary response of whether each patient had received PSA testing within the last year was modeled using a logit link function and a binomial distribution. Random effects representing practice accounted for similarities between patients attending the same practice. For patients, we included as predictors fixed effects of patient age; the number of visits within the last 2 years; the number of major comorbid conditions (including diabetes, asthma, hypertension or a heart condition); and whether the patient had received cholesterol screening in the past year. For the practices, potential fixed effect predictors included in all models were the number years practice in existence, whether the practice was solo or group practice, and the average age of each practices’ patients. Because there were missing values for at least one of the practices, additional practice-level descriptors were added individually to the model to examine significance in an effort not to dilute power. These included office volume (number of office visits, number of clinicians); minority status of the practice; and percent of payer mix with Medicare or Medicaid, as well as organizational attributes measured by aggregated responses to the SOAPC (communication, decision making, stress, and history of change). All analyses implemented used the SAS/STAT software (SAS system for Windows, version 9.1.3, SAS Institute, Inc., Cary, NC).

Results

The majority of practices were group practices (74%). Two thirds of the patient panel (67%) in each practice was estimated to be white (see Table 1). Practices estimated that, on average, 23% of their patients received Medicare benefits compared with 8% who received Medicaid coverage. The average practice had been in existence 10.43 years (SD, 9.06 years). The average age of men in the practice was 55.73 years (SD, 15.96 years) and the average age of men who were included in this chart audit was 65.05 years (SD, 10.30 years).

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Table 1.

Community-Based Practice Characteristics (n =46)

The average rate of PSA testing within the past year was 76.68%. Among men aged 50 to 74 and among those at least 75 years of age, these rates were 77.22% and 74.58%, respectively.

The CMH test indicated no significant trend in the rate of PSA testing depending on age (within the past year: χ2 = 2.04, degrees of freedom = 1, P = .15; within the past 2 years: χ2 = 0.73, P = .39; within the past 5 years: χ2 = 0.29, P = .59). Table 2 provides the rates of PSA testing for each age category, summing over practices.

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Table 2.

Age Categories and Frequencies (%) of Those with Prostate-Specific Antigen Testing*

Table 3 provides results of the initial hierarchical model exploring predictors of PSA testing within the past year for those older than 75. The only significant predictor was whether a patient had received cholesterol screening within the past year (P = .012).

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Table 3.

Odds Ratios Derived from the Multivariate Hierarchical Model Describing the Odds of Prostate-Specific Antigen Testing during the Last Year*

Table 4 contains significance of the additional organizational predictors, for which we had information about a subset of 28 practices. Only the organizational attribute labeled “Communication” is significant (P = .022). The effect size is large with an odds ratio of 0.20 when comparing practices at the 25th and 75th percentiles of communication. Thus, the odds of testing a patient within the past year were 80% smaller within a practice scoring at the 75th percentile on communication relative to a practice scoring at the 25th percentile.

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Table 4.

Odds Ratios Derived from the Hierarchical Model Describing the Odds of Prostate-Specific Antigen Testing during the Last Year*

Discussion

Data from this study provide further support to the existing literature that shows PSA testing is common in primary care practices9,11–15 and provides an updated look at PSA testing in community-based family medicine practices. The average practice testing rate of 77% for men aged 50 to 74 observed in this study is higher than rates reported in earlier chart audit studies,18,19 but it is comparable with self-report data collected for New Jersey in the 2001 Behavioral Risk Factor Surveillance Study, which placed PSA testing rates between 61% and 77%.3 Our testing rate of 75% among men ≥75 years of age is higher than the rates of 18%30-56%31 that are published in other studies. However, this is not totally unexpected given a recent study that found that family physicians were more likely to screen men aged ≥75 than other primary care providers.10 We hypothesize that increased awareness of prostate cancer from the early 1990s, when the original chart audit studies were conducted, and targeted public service announcements may account for the increase reported. In addition, the small number of men older than 75 as well as continued testing among men ages ≥75 in community settings may also account for the rates observed.

This study found an initial association between PSA testing and cholesterol screening. This association became insignificant, however, when other organizational factors such as communication were examined in the analysis. Specifically, we found that practices with higher communication scores (eg, practices that promote constructive work relationships, promote a team atmosphere between staff and clinicians, and resolve conflict and tension) screened men aged ≥75 at lower rates than others. We have seen in other studies that office systems and environment impact the delivery of preventive screening. 34–36,41–45 Our data suggest that these conditions may also impact the provision of PSA testing. It is important that future studies examine the larger context in which preventive services are offered to better understand and address the organizational dynamics that contribute to observed practice prostate cancer screening rates.

This study highlights a practice that has been largely ignored: PSA testing of men ≥75 years of age in community settings. Practice guidelines4–8 suggest that men older than 75 with limited life expectancy (<10 years) have little to gain from prostate cancer screening and PSA testing unless they have a particularly aggressive tumor.51 Although there are a handful of studies that associate radical prostatectomy with moderate mortality reduction26–28 for localized prostate cancer, the larger body of literature suggests that treatment for elderly men neither substantially increases either lifespan7,8 nor quality of life.21,23,29 However, we found in this study (not unlike others10,16,31,52) that a surprisingly high proportion (75%) of men older than 75 are screened. Lu Yao et al21 question the wisdom of screening men at such ages, citing little benefit and comparable life expectancy for men older than 70 who choose not to have treatment versus men who choose definitive treatment. The 2001 Institutes of Medicine report, Crossing the Quality Chasm: A New Health System for the 21st Century53 articulated several aims for health care including that it be effective, patient centered, and efficient. With the new guideline from the USPSTF that gives a D (“do not screen”) recommendation24 for men 75 years of age and older, it is clear that there is a lack of evidence showing that aggressive prostate cancer screening and subsequent treatment for elderly men is either effective, patient centered, or efficient.

Although current guidelines recommend that prostate cancer screening occur within the context of informed decision making,4–8 there are a growing number of studies documenting that informed decision making has yet to be incorporated as a routine part of primary care practice.16,54,55 Lu-Yao et al21 report that 88% of elderly men (75 years of age and older) indicated that their doctor suggested that they have PSA testing, but fewer than two-thirds reported discussing both pros and cons of PSA testing with their physicians. Similarly, a study of community physicians found that physicians ordered PSA tests without discussing them with their patients, citing medical and legal liability concerns.54 During the time period in which our data were collected, there was much discussion along the East Coast about a heavily publicized case of malpractice that involved PSA testing that may have affected testing decisions.56,57 Data from our study and these others suggest that this is a research area in need of further study, with major implications for potential design of targeted interventions focused on prostate cancer screening.

Study findings should be interpreted while considering several potential limitations. First, the race of patients in this sample was largely unknown. Most medical records for patients in this study did not record patient race or ethnicity. Because we relied on chart data rather than self-report data, we were unable to examine the effects of patient race and ethnicity on PSA testing. Second, our outcome measure highlights PSA usage but does not provide a comprehensive look at prostate cancer screening. The measure does not include clinician use of DRE and does not distinguish between PSA testing that was initiated for diagnostic versus preventive screening purposes. The parent study did not include data about urologic problems or the cancer status of patients. Therefore, we could not distinguish between men who were being evaluated for lower urinary tract symptoms versus those undergoing prostate cancer screening. Although these are important limitations, guidelines from USPSTF24 and the American Urological Association58 recommend against PSA testing for either purpose in elderly populations, calling into question its value for men whose natural lifespan is <10 years. Therefore, we suggest that it is important to examine the practice of PSA testing regardless of the reason for initiation (ie, preventive cancer screening, diagnosis, monitoring) among elderly populations.

Despite these limitations, data from this study are suggestive for interventions focused on PSA testing and prostate cancer screening in primary care settings. Much of the previous research on prostate cancer screening focuses on understanding patient and physician characteristics that influence screening decisions. It is unclear what is driving decision-making processes about who receives PSA testing and prostate cancer screening in primary care practices. Is this a decision made unilaterally by physicians or nurse practitioners on an individual basis? Are there standing orders and, if so, how are they tailored? Are laboratories generating this data as part of a routine blood work panel? How does the patient's wish impact these processes? We suggest that future research is needed to better understand the circumstances in which PSA testing and prostate cancer screening is initiated in primary care settings so that intervention studies focused on providing testing for the most appropriate populations can be better calibrated to address patient, physician, and organization correlates of testing.

Notes

  • This article was externally peer reviewed.

    Funding: This research was conducted in conjunction with the New Jersey Family Medicine Research Network (NJFMRN), a shared resource of the Cancer Institute of New Jersey and the Eastern Pennsylvania Inquiry Collaborative Network (EPICnet). It was also supported by the Cancer Institute of New Jersey's Survey Research and Qualitative Methods Shared Resource. This research was supported through grants from the National Cancer Institute (K01 CA131500-01A1); National Heart, Blood and Lung Institute (R01 HL70800); the New Jersey Commission on Cancer Research (03-40-CCR-S0); and the Department of Defense (DAMD 17-01-1-0755).

    Conflict of interest: none declared.

  • Received for publication June 26, 2008.
  • Revision received October 27, 2008.
  • Accepted for publication November 6, 2008.

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The Journal of the American Board of Family Medicine: 22 (3)
The Journal of the American Board of Family Medicine
Vol. 22, Issue 3
May-June 2009
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Prostate-Specific Antigen Testing among the Elderly in Community-Based Family Medicine Practices
Shawna V. Hudson, Pamela Ohman-Strickland, Jeanne M. Ferrante, Grace Lu-Yao, A. John Orzano, Benjamin F. Crabtree
The Journal of the American Board of Family Medicine May 2009, 22 (3) 257-265; DOI: 10.3122/jabfm.2009.03.080136

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Prostate-Specific Antigen Testing among the Elderly in Community-Based Family Medicine Practices
Shawna V. Hudson, Pamela Ohman-Strickland, Jeanne M. Ferrante, Grace Lu-Yao, A. John Orzano, Benjamin F. Crabtree
The Journal of the American Board of Family Medicine May 2009, 22 (3) 257-265; DOI: 10.3122/jabfm.2009.03.080136
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