Purpose: The primary objective was to describe the specific socio-demographic variables that are associated with colorectal cancer (CRC) under-screening in an urban, inner city population. The secondary objective was to determine the overall proportion of eligible patients who are not appropriately screened. Methods: A retrospective chart review of patients eligible for average-risk CRC screening as per Ontario’s ColonCancerCheck program guidelines was conducted at an academic, inner city family health practice associated with St. Michael’s Hospital in Toronto, Ontario. Simple measures of association, including t-tests and chi-square tests, were used to determine the relationships between screening and demographic characteristics. Based on a type I error rate of 0.05 and an appropriate sample size, the calculated power for this study was 0.82. Results: A total of 200 patients were randomly selected; 54% were male; the majority were non-immigrants (77.5%) and were employed or retired (76.5%). Fifty-five percent of screened patients were up to date as per guidelines; 29.5% and 31% were up to date with a fecal occult blood test or a colonoscopy respectively. Individuals with psychiatric illness (p = 0.0005), with no history of prior cancer screening for other cancers (p = 0.0001), on disability or unemployed (p = 0.0010), or who were younger (p = 0.0062) were significantly less likely to undergo CRC screening. Conclusion: Colorectal cancer screening rates at this academic, urban family practice were very similar to province wide screening rates. Future studies should focus on group specific interventions to increase CRC screening uptake in low CRC screened populations.
Colorectal cancer (CRC) is currently the third most prevalent cancer and second most common cause of cancer mortality among Canadians, with an estimated 23,800 new cases and 9200 projected deaths expected for 2013 [
In April 2008, Cancer Care Ontario (CCO) initiated a province-wide CRC screening initiative called the ColonCancerCheck program [
Several barriers to CRC screening have been reported in the literature, many of which encompass social determinants of health. The most commonly cited factors correlated with under-screening include low level of edu- cation, low socioeconomic status (SES), lack of acculturation/recent immigration, lack of insurance, no primary care provider, ethnicity (specifically African-Americans, Hispanics and Asians in the US), and male gender [
The primary objective of this study was to describe the specific socio-demographic variables that were associ- ated with CRC under-screening in an urban, inner city population. The secondary objective was to determine the overall proportion of eligible patients who were not appropriately screened.
A retrospective chart review of patients eligible for average-risk CRC screening as per Ontario’s ColonCancerCheck program guidelines was conducted at an academic inner city family health practice in Toronto. The Department of Family & Community Medicine, affiliated with St. Michael’s Hospital in Toronto, Ontario caters to a large and diverse inner city population of patients, and its providers have expertise in areas of HIV primary care, addiction medicine, and care of poor, homeless or under-housed populations, adolescents and new immigrants.
Patients were eligible for inclusion in the study if they were current patients of the family practice, defined as having had at least 1 visit per year during the study period (January 1, 2011 to December 31, 2012) and at least 1 visit within the year preceding the study period, 50 years or older as of January 1st, 2011, and 74 or younger as of December 31st, 2012. To ensure that only individuals eligible for average-risk screening were assessed, exclusion criteria included: patients with a previous diagnosis of CRC, those with one or more first-degree relatives with CRC, and those with hereditary or familial syndromes which predispose an individual to CRC. Only patients that were eligible for CRC screening as of the start of the study period were considered eligible for inclusion.
Information collected from retrospective chart review included age, gender, marital status, occupation, postal code, immigration status, smoking history, current psychiatric illness, history of cancer screening for breast, prostate or cervical cancer, and date of last gFOBT, FS, or colonoscopy.
Socioeconomic status of individuals was assessed using two methods: 1) individuals on disability programs (for example, Ontario Disability Support Program (ODSP)) or that were unemployed were compared to those that were listed as employed or retired, and 2) the postal codes of each patient were used to determine their Quintile of Annual Income Per Person Equivalent (QAIPPE). This method, devised by Statistics Canada, takes a household size-adjusted measure of household income from the 2006 census for a particular postal code and expresses it in person-equivalents implied by the low income cut-offs [
A randomized list of 200 patients that met the inclusion/exclusion criteria was generated. This sample size was selected to balance both the feasibility of time required for data collection yet still providing a reasonable number of patients for analysis. Using the 2009 Statistics Canada report on CRC testing [
Descriptive statistics were used to describe the study population. Simple measures of association, such as t-tests and chi-square tests, were used to determine the relationships between screening and demographic charac- teristics. All statistics were generated through SAS (version 9.4, SAS institute, Cary, NC) statistical software.
This study was approved by the St. Michael’s Hospital Research Ethics Board.
Of the 200 randomly selected patients meeting inclusion and exclusion criteria, 54% were male, and the majority were non-immigrants (77.5%), non-smokers (70.5%), had a history of prior cancer screening for other sites (78%), had no psychiatric illness (77%) and were employed or retired (76.5%) (
A total of 110 patients (55%) were up to date with CRC screening according to guidelines. The two most common screening methods were gFOBT and colonoscopy: 60 patients (30%) had a gFOBT and 62 patients (31%) had a colonoscopy that fell within screening guidelines. Of the 90 patients that were not up to date on CRC screening, 27 (13.5%) had been previously screened but were no longer within guidelines. The remaining 63 patients (31.5%) had no history of any prior CRC screening (
Patients with psychiatric illness (p = 0.0005), with no history of prior screening for other cancers (p = 0.0001), on disability or unemployed (p = 0.0010), or who were younger (p = 0.0062) were significantly less likely to undergo CRC screening (
The CRC screening rate within our academic, inner city family practice compares favourably to the rest of Ontario. Our study found that 55% of patients sampled were up-to-date with CRC screening compared with 53% of Ontarians and 51% specifically where St. Michael’s Hospital is located in the Toronto Central Local Health Integrated Network (LHIN) [
The four demographic variables found to be significantly related to poorer CRC screening were younger age, no prior history of other cancer screening, active psychiatric illness, and being on disability or unemployed. Si- milar results have been reported with patients 65 years and under significantly less likely to undergo CRC screening [
. Patient demographics.
Age | |
---|---|
Mean = 61 | Range: 50 - 75 |
Gender | |
M = 108 (54%) | F = 92 (46%) |
Relationship status | |
Married/Common Law | 103 (51.5%) |
Single | 49 (24.5%) |
Divorced/Separated | 35 (17.5%) |
Widowed | 12 (6%) |
Unknown | 1 (0.5%) |
Immigration status | |
Non-immigrant | 155 (77.5%) |
20+ years | 16 (8%) |
10 - 19 years | 11 (5.5%) |
0 - 9 years | 4 (2%) |
Unknown | 14 (7%) |
Current smoker? | |
Yes | 54 (27%) |
No | 141 (70.5%) |
Unknown | 5 (2.5%) |
History of other cancer screening | |
Yes | 156 (78%) |
No | 78 (39%) |
Unknown | 5 (2.5%) |
Psychiatric illness? | |
Yes | 46 (23%) |
No | 154 (77%) |
On disability or receiving unemployment | |
Yes | 47 (23.5%) |
No | 153 (76.5%) |
Neighbourhood income quintiles by postal code | |
1 (lowest) | 49 (24.5%) |
2 | 39 (19.5%) |
3 | 26 (13%) |
4 | 34 (17%) |
5 (highest) | 46 (23%) |
Unknown | 6 (3%) |
. Comparison of screening modalities used and CRC screening status.
Screening modality | Up to date CRC screening | Out of date CRC Screening | Total |
---|---|---|---|
gFOBT only | 48 | 23 | 71 |
Colonoscopy only | 50 | 2 | 52 |
gFOBT + colonoscopy | 12 | 2 | 14 |
No testing performed | 0 | 63 | 63 |
Total | 110 | 90 | 200 |
. Association between demographic characterisitcs and CRC screening.
Characteristic | CRC screening up to date (n = 110) | CRC screening not up to date (n = 90) | p-value |
---|---|---|---|
Age group | n (%) | 0.0062 | |
50 - 59 | 46 (41.8) | 52 (57.8) | |
60 - 69 | 40 (36.4) | 32 (35.6) | |
70 - 74 | 24 (21.8) | 6 (6.7) | |
Gender | 0.4937 | ||
Male | 57 (51.8) | 51 (56.7) | |
Female | 53 (48.2) | 39 (43.3) | |
Relationship status | 0.3071 | ||
Single, widowed, divorced/separated | 49 (45.0) | 47 (52.2) | |
Married/common law, long-term partner | 60 (55.0) | 43 (47.8) | |
Immigration status | 0.3551 | ||
Non-immigrant | 89 (85.6) | 66 (80.5) | |
Immigrant | 15 (14.4) | 16 (19.5) | |
Current smoker | 0.0572 | ||
Yes | 24 (22.2) | 30 (34.5) | |
No | 84 (76.4) | 57 (63.3) | |
History of other cancer screening | 0.0001 | ||
Yes | 97 (89.8) | 59 (67.8) | |
No | 11 (10.0) | 28 (31.1) | |
Psychiatric illness | 0.0005 | ||
Yes | 15 (13.6) | 31 (34.4) | |
No | 95 (86.4) | 59 (65.6) | |
On disability/receiving unemployment | 0.0010 | ||
Yes | 16 (14.6) | 31 (34.4) | |
No | 94 (85.4) | 59 (65.6) | |
Income quintile | 0.9965 | ||
1 | 28 (25.9) | 21 (24.4) | |
2 | 21 (19.4) | 18 (20.9) | |
3 | 15 (13.9) | 11 (12.8) | |
4 | 19 (17.6) | 15 (17.4) | |
5 | 25 (23.2) | 21 (24.4) |
been reported in prior literature [
As stated previously, low SES is a particularly important contributor to poor CRC screening rates [
Comparison of demographics and CRC screening status
Comparison of income quintiles and CRC screening status
dividuals on disability or unemployment. Toronto neighbourhoods have drastically changed over the last 10 to 20 years with the gentrification of the city’s core and the start of mixed-income revitalization projects in traditionally poorer neighbourhoods [
A highly significant finding in this study was the association between lack of CRC screening and mental illness. Several other studies have reported lower cancer screening rates in patients with mental illnesses but few have addressed the reasons for such a discrepancy. Factors such as poor communication and lack of continuity of care between primary care providers and psychiatric services, stigma of mental illness, time and resource constraints, health and lifestyle factors of patients and effects of mental illness have all been reported as potential reasons for poor cancer screening [
Several strategies have been proposed by CCO to increase CRC screening rates. Proposed plans include expanding their invitation system to reach more newly-eligible Ontarians and more individuals requiring re-screen- ing, increasing support of public and provider education, and potentially implementing fecal immunochemical tests (FIT) to replace the gFOBT. The newer FITs are more sensitive and associated with higher screening participation as they require less at home stool sampling [
There are a few limitations to this study. As this is a retrospective review, the data collected is subject to selection bias as well as physician reporting and recall. In addition, a randomly selected sample of 200 individual charts was used to extrapolate findings for all patients and therefore these findings may not be completely generalizable. Finally, this is a single institution study and may not be completely representative of Toronto’s inner city population as all the individuals studied had primary health care providers.
Colorectal cancer screening rates at this academic, inner city family practice are analogous to province wide screening data. Barriers to CRC screening included being younger, having a psychiatric illness, being on disability or unemployed, and having no prior history of any cancer screening. Smoking was of borderline significance. Future studies that focus on group specific interventions to increase CRC screening uptake are warranted.