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CMAJ : Canadian Medical Association Journal logoLink to CMAJ : Canadian Medical Association Journal
. 2013 Apr 2;185(6):E263–E269. doi: 10.1503/cmaj.121383

The effect of socioeconomic status on access to primary care: an audit study

Michelle E Olah 1, Gregory Gaisano 1, Stephen W Hwang 1,
PMCID: PMC3612171  PMID: 23439620

Abstract

Background:

Health care office staff and providers may discriminate against people of low socioeconomic status, even in the absence of economic incentives to do so. We sought to determine whether socioeconomic status affects the response a patient receives when seeking a primary care appointment.

Methods:

In a single unannounced telephone call to a random sample of family physicians and general practices (n = 375) in Toronto, Ontario, a male and a female researcher each played the role of a patient seeking a primary care physician. Callers followed a script suggesting either high (i.e., bank employee transferred to the city) or low (i.e., recipient of social assistance) socioeconomic status, and either the presence or absence of chronic health conditions (diabetes and low back pain). We randomized the characteristics of the caller for each office. Our primary outcome was whether the caller was offered an appointment.

Results:

The proportion of calls resulting in an appointment being offered was significantly higher when the callers presented themselves as having high socioeconomic status than when they presented as having low socioeconomic status (22.6% v.14.3%, p = 0.04) and when the callers stated the presence of chronic health conditions than when they did not (23.5% v. 12.8%, p = 0.008). In a model adjusted for all independent variables significant at a p value of 0.10 or less (presence of chronic health conditions, time since graduation from medical school and membership in the College of Family Physicians of Canada), high socioeconomic status was associated with an odds ratio of 1.78 (95% confidence interval 1.02–3.08) for the offer of an appointment. Socioeconomic status and chronic health conditions had independent effects on the likelihood of obtaining an appointment.

Interpretation:

Within a universal health insurance system in which physician reimbursement is unaffected by patients’ socioeconomic status, people presenting themselves as having high socioeconomic status received preferential access to primary care over those presenting themselves as having low socioeconomic status.


Access to primary care is vital for good health.1 Unfortunately, people of low socioeconomic status encounter many barriers to obtaining health care.2 One potential barrier is discrimination by health care providers and office staff, where discrimination is defined as the process by which members of a socially defined group are treated differently owing to their membership in that group.3

Discrimination on the basis of socioeconomic status is difficult to distinguish from behaviour driven by economic incentives when there is a strong association between socioeconomic status and extent of health insurance coverage. Thus, the ideal setting for a study of discrimination is one in which physicians receive the same reimbursement regardless of a patient’s socioeconomic status. This situation prevails in Ontario, where all residents of the province are covered by a single public insurer, copayments by patients are not permitted, and there are no deductibles for physician visits.4

We sought to determine whether socioeconomic status and the presence or absence of chronic health conditions affect the response a person receives when calling physicians’ offices seeking a primary care appointment. Our main hypothesis was that people of high socioeconomic status would be more likely to be offered an appointment for primary care than people of low socioeconomic status.

Methods

Design

We used a randomized controlled audit study design in which we made unannounced telephone calls to the offices of a random sample of primary care physicians in Toronto, Ontario. Callers followed a standardized script and presented themselves as a person asking to be seen as a new primary care patient (Table 1). We contacted each office once, with randomization to 1 of 4 patient scenarios using a 2 × 2 design: high socioeconomic status (i.e., a bank employee transferred to the city) versus low socioeconomic status (i.e., receiving social assistance), and chronic health conditions (diabetes and back pain) versus no chronic health conditions. We used a random number generator for randomization. Our primary outcome was whether the caller received an unconditional offer of an appointment.

Table 1:

Scripts used by researchers posing as patients with different socioeconomic and health status characteristics

Patient scenario Script
Initial inquiry (all scenarios) Hello? Is this Dr. _____’s office? [Omitted if stated explicitly by the person answering the telephone]
High socioeconomic status, no chronic health conditions Hi. I was just transferred to Toronto with [name of major bank], and I need a family doctor for annual check-ups.
Is Dr. _____accepting new patients?
High socioeconomic status, with chronic health conditions Hi. I was just transferred to Toronto with [name of major bank], and I need a family doctor for my diabetes and back problems.
Is Dr. _____accepting new patients?
Low socioeconomic status, no chronic health conditions Hi. I’m calling ‘cause my welfare worker told me that I need a family doctor for annual check-ups.
Is Dr. _____accepting new patients?
Low socioeconomic status, with chronic health conditions Hi. I’m calling ‘cause my welfare worker told me that I need a family doctor for my diabetes and back problems.
Is Dr. _____accepting new patients?

Participants

In Canada, family physicians and general practitioners are the main providers of primary care. We used the College of Physicians and Surgeons of Ontario’s public database of all licensed physicians in Ontario to identify family physicians and general practitioners in active practice in Toronto as of December 2010 (www.cpso.on.ca/docsearch/). We selected a random sample of about 30% of these physicians and obtained the following data for each: name, sex, office telephone number, address of primary practice, medical school and year of graduation, membership in the College of Family Physicians of Canada and any practice restrictions. Census data from 2006 were used to determine the median household income tertile of the neighbourhood in which each primary practice was located.5

We excluded physicians’ offices for the following reasons: the primary practice address or telephone number was not listed in the database; the primary practice address was not in Toronto; the primary practice address was a hospital emergency department, an institution that provides health care only to a specifically defined population (e.g., a nursing home or student health centre) or an organization that does not provide primary care (e.g., an insurance company); physicians designated as residents or fellows in training; physicians whose medical licenses were restricted due to disciplinary action; physicians with practices limited to a specific clinical focus with no provision of primary care (e.g., hospital medicine, sports medicine, travel medicine, addiction medicine, weight loss, reproductive health care, sexual health, HIV care, oncology, geriatrics, palliative care); and physicians operating exclusively “walk-in” practices, where no appointments were given to patients. If 2 or more selected physicians shared the same office telephone number, we randomly selected 1 physician to be contacted and excluded the other physicians at that office.

Audit procedure

Two researchers, 1 male and 1 female, placed the telephone calls. We randomly assigned the sex of the caller for each physician’s office. The callers were trained to deliver each patient scenario in a similar manner using a neutral tone of voice. We provided standardized answers to be given in response to questions from the physician’s office (Appendix 1, available at www.cmaj.ca/lookup/suppl/doi:10.1503/cmaj.121383/-/DC1).

The researchers called the physicians’ offices from March 2011 to July 2011 using dedicated cell phones. We made at least 5 attempts to contact each office. We excluded physicians if information obtained during the call suggested that the physician’s practice had been permanently closed or that the physician met one of the exclusion criteria.

If an appointment was given, the researcher called back the following day to cancel the appointment.

Outcomes

Our primary outcome was whether the caller received an unconditional offer of an appointment. We coded responses as follows: an unconditional offer of an appointment to be seen for primary care; an offer of an appointment for an initial screening visit with a physician to determine whether the patient would be accepted for primary care; an offer to be placed on a waiting list for prospective new patients; or a refusal (most often for the stated reason that the physician was not currently accepting new patients). Offers of an initial screening visit or a place on a waiting list were considered to be intermediate outcomes, because they create additional opportunities for patient selection but are not equivalent to an outright refusal.6,7 We therefore performed 2 analyses — an analysis using the primary outcome (an unconditional offer of an appointment) and an analysis using a secondary outcome (an unconditional offer of an appointment, an offer of an initial screening visit or a place on a waiting list).

Statistical analysis

We estimated a priori that 20% of calls would result in the offer of an appointment and that a 10% absolute difference between groups would be clinically meaningful. To achieve power of 0.80 with an α level of 0.05, our target sample size was 270 in each of the socioeconomic status groups.

We used χ2 tests to compare the characteristics of physicians randomized to different patient scenarios and the proportion of calls that resulted in an appointment in different patient scenarios. We used the Breslow–Day test to determine whether there was heterogeneity in the association between patient socioeconomic status and outcomes among physicians with the characteristics shown in Table 2.

Table 2:

Characteristics of the physicians contacted during the study, by randomization group

Characteristic Randomization group, no. (%)

Socioeconomic status of patient Chronic health conditions of patient


High
n = 186
Low
n = 189
p value No
n = 179
Yes
n = 196
p value
Female sex 71 (38.2) 90 (47.6) 0.07 68 (38.0) 93 (47.4) 0.07

Graduate of LCME-accredited medical school 124 (66.7) 129 (68.3) 0.7 117 (65.4) 136 (69.4) 0.4

Time since graduation from medical school, yr 0.4 0.9

 1–10 20 (10.8) 16 (8.5) 16 (8.9) 20 (10.2)

 11–20 26 (14.0) 35 (18.5) 28 (15.6) 33 (16.8)

 ≥ 21 140 (75.3) 138 (73.0) 135 (75.4) 143 (73.0)

Member of the College of Family 103 (55.4) 100 (52.9) 0.6 95 (53.1) 108 (55.1) 0.7

Physicians of Canada

Median income tertile of neighbourhood in which primary practice is located 0.07 0.3

 Low 57 (30.6) 59 (31.2) 58 (32.4) 58 (29.6)

 Middle 78 (41.9) 60 (31.7) 59 (33.0) 79 (40.3)

 High 51 (27.4) 70 (37.0) 62 (34.6) 59 (30.1)

Note: LCME = Liason Committee on Medical Education.

We constructed a logistic regression model in which the dependent variable was the outcome of the request for an appointment and the independent variables were the patient’s socioeconomic status and presence or absence of chronic health conditions. We then introduced an interaction term to test for an interaction between socioeconomic status and chronic health conditions. In addition, we constructed logistic regression models in which the dependent variable was the outcome of the request for an appointment and the independent variables were all available characteristics of the patient and physician. We calculated adjusted odds ratios (ORs) in multivariate models that included all independent variables that were significant in univariate analyses at a p value of 0.10 or less.

Ethical review

This study was approved by the Research Ethics Board of St. Michael’s Hospital with some considerations. First, there was no appreciable risk to participants, and the burden of participation in the study was minimal. Second, although the study involved a minor deception and was conducted without the informed consent of participants, our approach was justified owing to the lack of risk to participants and because informed consent would likely alter the behaviour of participants in a way that would render our results invalid. Third, after we completed the collection of the data, we sent a disclosure letter to all physicians whose offices had been randomized to receive a call. Finally, we have taken measures to protect the identity of the physicians, and our study design precluded the possibility of identifying discriminatory practices by any specific physician’s office.

Results

We identified 3367 family physicians and general practitioners in active practice in Toronto in the database. We selected a random sample of 985 physicians, of whom 568 were eligible for the study and randomized to 1 of 4 patient scenarios (Figure 1). We were unable to contact anyone at 51 of these offices (9%), and we found 142 offices (25%) to be ineligible for the study at the time of the call because they were either permanently closed (n = 64) or had a limited scope of practice, with no provision of primary care (n = 78).

Figure 1:

Figure 1:

Selection of physicians for the audit. CPSO = College of Physicians and Surgeons of Ontario.

Our analyses include outcome data from 375 offices. Most of the responses we obtained were from secretaries and administrative assistants (data not shown). There were no significant differences in the characteristics of the physicians at these offices by randomization group (Table 2).

Overall, 69 (18.4%) requests resulted in an appointment being offered, 33 (8.8%) resulted in an offer for a screening visit and 12 (3.2%) resulted in an offer to be placed on a waiting list. A caller with high socioeconomic status was significantly more likely than a caller with low socioeconomic status to be offered an appointment (22.6% v. 14.3%, p = 0.04), or to be offered an appointment, screening visit or place on a waiting list (37.1% v. 23.8%, p = 0.005) (Table 3). We saw no evidence of heterogeneity in this association related to any physician characteristic. A caller with chronic health conditions was significantly more likely than a caller with no such conditions to be offered an appointment (23.5% v. 12.8%, p = 0.008) (Table 3). Socioeconomic status and the presence of chronic health conditions had independent effects on the likelihood of obtaining an appointment, and there was no evidence of a significant interaction effect between these 2 factors. The sex of the caller had no effect on the probability of being offered an appointment.

Table 3:

Outcome of telephone call, by patient characteristic

Characteristic No. of physician offices contacted Outcome

Offered an appointment Offered an appointment, screening visit or place on a waiting list


No. (%) p value* No. (%) p value*
Overall 375 69 (18.4) NA 114 (30.4) NA

SES 0.04 0.005

 High 186 42 (22.6) 69 (37.1)

 Low 189 27 (14.3) 45 (23.8)

Chronic health conditions 0.008 0.10

 No 179 23 (12.8) 47 (26.3)

 Yes 196 46 (23.5) 67 (34.2)

Combined scenario 0.009 0.01

 High SES, no chronic health conditions 88 14 (15.9) 30 (34.1)

 High SES, with chronic health conditions 98 28 (28.6) 39 (39.8)

 Low SES, no chronic health conditions 91 9 (9.9) 17 (18.7)

 Low SES, with chronic health conditions 98 18 (18.4) 28 (28.6)

Sex 0.8 0.9

 Male 212 40 (18.9) 65 (30.7)

 Female 163 29 (17.8) 49 (30.1)

Note: NA = not applicable, SES = socioeconomic status.

*

χ2 test.

In an adjusted model accounting for patient and physician characteristics (Table 4), high socioeconomic status was associated with the offer of an appointment (OR 1.78 [95% confidence interval (CI) 1.02–3.08]) and with the offer of an appointment, screening visit or place on a waiting list (OR 1.93 [95% CI 1.21–3.11]). The presence of chronic health conditions was also associated with an offer of an appointment (OR 2.10 [95% CI 1.20–3.68]) and with an offer of an appointment, screening visit or a place on a waiting list (OR 1.45 [95% CI 0.91–2.32]) (Table 4).

Table 4:

Association between patient and physician characteristics and outcome of telephone call

Independent variables Outcome

Offered an appointment Offered an appointment, screening visit or place on a waiting list


Unadjusted OR (95% CI) Adjusted OR* (95% CI) Unadjusted OR (95% CI) Adjusted OR* (95% CI)
Patient characteristic

High SES 1.75 (1.03–2.98) 1.78 (1.02–3.08) 1.89 (1.21–2.95) 1.93 (1.21–3.11)

Chronic health conditions 2.08 (1.20–3.60) 2.10 (1.20–3.68) 1.46 (0.94–2.28) 1.45 (0.91–2.32)

Female sex 0.93 (0.55–1.58) 0.97 (0.62–1.52)

Physician characteristic

Female sex 1.28 (0.76–2.15) 1.51 (0.97–2.35) 1.12 (0.68–1.83)

Graduate of LCME-accredited medical school 1.04 (0.59–1.82) 1.13 (0.70–1.81)

Time since graduation from medical school graduation, yr

 1–10 1.00 (ref) 1.00 (ref) 1.00 (ref) 1.00 (ref)

 11–20 0.74 (0.30–1.86) 0.84 (0.33–2.15) 0.30 (0.13–0.70) 0.34 (0.14–0.81)

 ≥ 21 0.42 (0.19–0.91) 0.66 (0.28–1.54) 0.19 (0.09–0.40) 0.29 (0.13–0.64)

Member of the College of Family Physicians of Canada 2.63 (1.48–4.67) 2.29 (1.20–4.40) 2.64 (1.65–4.22) 1.96 (1.13–3.40)

Median income tertile of neighborhood where primary practice is located

 Low 1.00 (ref) 1.00 (ref)

 Medium 1.05 (0.55–1.99) 0.98 (0.57–1.68)

 High 1.01 (0.52–1.95) 1.06 (0.61–1.84)

Note: CI = confidence interval, LCME = Liaison Committee on Medical Education, OR = odds ratio, SES = socioeconomic status.

*

Adjusted for all independent variables that were significant in univariate analyses at p ≤ 0.10 (presence of chronic health conditions, time since graduation from medical school and membership in the College of Family Physicians of Canada).

Interpretation

A person calling a physician’s office and asking to be seen as a new primary care patient was more than 50% more likely to be given an appointment if he or she presented as being of high socioeconomic status. Because we see this finding in a single-payer universal health insurance system, it provides evidence of discrimination by physicians’ offices on the basis of socioeconomic status. The effect of socioeconomic status was independent of the presence or absence of chronic health conditions.

Although our study was not designed to identify why individuals of low socioeconomic status were less likely to receive appointments for primary care than their higher status counterparts, staff at physicians’ offices may hold negative attitudes toward this group, especially toward people receiving social assistance. Physicians have been shown to perceive patients with low socioeconomic status more negatively in terms of their personalities, abilities, behavioural tendencies and role demands.8 Most previous studies of discrimination in health care have examined the effects of patient race or ethnic background on treatment decisions.9,10 These studies have typically presented physicians with clinical vignettes11,12 or used observational databases and adjusted for confounding factors.13 Far fewer studies have focused on discrimination on the basis of patient socioeconomic status.8,14 Audit studies, a well-established method of testing for discrimination in labour and housing markets,1517 have been used in the United States to show that Medicaid recipients and patients who are uninsured encounter substantial barriers to care.1821 However, these effects may be due to the economic incentive of differing levels of reimbursement, rather than discrimination on the basis of socioeconomic status itself.

Financial barriers to accessing primary care are greatly reduced within Canada’s system of universal health insurance.22 However, 15% of Canadians report that they do not have a regular medical doctor. Among those patients who have looked for a doctor unsuccessfully, the most common reason given for not having a doctor is that local physicians are not accepting new patients.23 During the past decade, the province of Ontario has encouraged primary care providers to shift from a fee-for-service model to a capitated system in which payments are adjusted for age and sex but not patient comorbidities.24,25 This situation creates a possible financial incentive to preferentially enrol patients with few or no chronic health conditions. We found no evidence of such selection; on the contrary, a strong trend in the opposite direction was found, with physicians’ offices giving preferential access to patients with chronic health problems. This finding suggests that patients with greater medical needs are being appropriately prioritized.

Limitations

We examined the behaviour of staff at physicians’ offices, which does not necessarily reflect the attitudes or directives of the physicians; nonetheless, any discriminatory behaviour by office staff can clearly have an adverse effect on patients’ access to physicians.

Referring to having a welfare worker was chosen as one of the few plausible and effective ways for the caller to rapidly convey low socioeconomic status. As a result, our study cannot distinguish between discrimination on the basis of low socioeconomic status and discrimination directed specifically against recipients of social assistance. Furthermore, we could not account for further patient selection that may take place at an initial screening visit or when patients are chosen from a waiting list. In addition, we did not have access to information on the reimbursement model (fee-for-service, capitation or blended) under which the physicians were practising.

We chose not to use a study design in which each physician’s office received paired calls from callers of high and low socioeconomic status. Although such a design would have had greater power to detect discrimination, the calls would have to have been separated in time to reduce the risk of detection. Our results might then have been influenced by the intermittent opening and closing of physicians’ practices to new patients, a phenomenon that is common in the geographic area in which we conducted this study.

Finally, our results may not be generalizable to jurisdictions in which there is a plentiful supply of primary care physicians who are accepting new patients.

Conclusion

This study provides evidence that discrimination against patients of low socioeconomic status can occur within a universal health insurance system and have an adverse effect on access to primary health care. Although it is reassuring that patients with chronic health conditions received prioritized access to primary care, our results suggest a need for greater efforts to ensure that physicians and their office staff do not discriminate against people of low socioeconomic status. Further research is needed to determine whether discrimination on the basis of socioeconomic status has an effect on other aspects of health care, such as quality of care and patient–physician communication.

Supplementary Material

Online Appendix

Acknowledgements

The authors thank Marisa Creatore and Peter Gozdyra for providing neighbourhood income data; Jonathan K.B. Hwang for assistance with the preparation of patient scripts and with data entry; and the faculty and staff of the Determinants of Community Health 2 Course, Faculty of Medicine, University of Toronto, for their assistance. The Centre for Research on Inner City Health gratefully acknowledges the support of the Ontario Ministry of Health and Long-Term Care. The views expressed in this publication are the views of the authors and do not necessarily reflect the views of the Ontario Ministry of Health and Long-Term Care or any of the above named organizations or individuals.

Footnotes

Competing interests: None declared.

This article has been peer reviewed.

Contributors: Gregory Gaisano and Michelle Olah contributed equally to this work. All of the authors made substantial contributions to the conception and design of the study, the collection and interpretation of the data, and the writing and revising of the manuscript for important intellectual content. All of the authors approved the final version submitted for publication.

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