Breast cancer screening outside of guidelines

Figure 7.1

Percentage of self-reported screening mammograms performed in asymptomatic^† women within and outside the recommended target age range for screening in the past two years, by province/‌territory — 2012 reporting year

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^† An asymptomatic woman is deemed to have had screening mammography if her reason for undergoing a mammogram was one of the following: family history of breast cancer, regular check-up/‌routine screening, age or current use of hormone replacement therapy.

^E Interpret with caution owing to large variability in the estimate.

* Suppressed owing to small numbers.

Data source: Statistics Canada, Canadian Community Health Survey.

Data Table

Jurisdiction Age group	Mammogram	Percent (%)	Quality Indicator	Lower bound of 95% confidence interval	Upper bound of 95% confidence interval
YT	Within guidelines: 50–74	47	86.5		76.1	96.9
YT	Outside guidelines: 35–49 or 75+	20	13.5	E	8	19
NB	Within guidelines: 50–74	434	84.3		79.3	89.2
NB	Outside guidelines: 35–49	32	3.6	E	2.1	5.1
NB	Outside guidelines: 75+	43	12.1	E	7	17.3
QC	Within guidelines: 50–74	1,861	82.5		79.3	85.8
QC	Outside guidelines: 35–49	144	5.9		4.6	7.2
QC	Outside guidelines: 75+	136	11.5		8.1	15
SK	Within guidelines: 50–74	474	78.4		72.7	84
SK	Outside guidelines: 35–49	89	8.6		6.3	10.9
SK	Outside guidelines: 75+	44	13	E	6.9	19.1
MB	Within guidelines: 50–74	477	74.9		67.4	82.3
MB	Outside guidelines: 35–49	64	6.7	E	4.1	9.3
MB	Outside guidelines: 75+	40	18.4	E	10.5	26.4
ON	Within guidelines: 50–74	3,300	74.2		71.4	77
ON	Outside guidelines: 35–49	477	7		5.9	8
ON	Outside guidelines: 75+	408	18.9		15.9	21.8
NS	Within guidelines: 50–74	352	73.1		65.8	80.4
NS	Outside guidelines: 35–49	39	4.9	E	2.8	7
NS	Outside guidelines: 75+	62	22	E	14.4	29.6
NL	Within guidelines: 50–74	295	73.1		65.3	81
NL	Outside guidelines: 35–49	33	6.2	E	3.7	8.7
NL	Outside guidelines: 75+	54	20.7	E	12.4	28.9
AB	Within guidelines: 50–74	832	71.7		66.8	76.6
AB	Outside guidelines: 35–49	103	5.4		4	6.8
AB	Outside guidelines: 75+	147	22.9		17.8	28
BC	Within guidelines: 50–74	1,091	70.2		66.3	74
BC	Outside guidelines: 35–49	159	7.4		5.8	9
BC	Outside guidelines: 75+	222	22.5		18.3	26.6
PE	Within guidelines: 50–74	136	66.4		56.6	76.3
PE	Outside guidelines: 35–49	16	7.2	E	3.3	11.2
PE	Outside guidelines: 75+	18	26.3	E	15.7	36.9
NT	Within guidelines: 50–74	46	62.3		49.5	75.2
NT	Outside guidelines: 35–49 or 75+	27	37.7	E	24.8	50.5
NU	Within guidelines: 50–74	*	*	*	*	*
NU	Outside guidelines: 35–49	*	*	*	*	*
NU	Outside guidelines: 75+	*	*	*	*	*

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Figure 7.5

Percentage of all screening mammograms^† in the past year reported by women aged 40–49, by jurisdiction^‡ — 2008–12 reporting years combined

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Show Confidence Intervals - Figure 7.5

^E Interpret with caution owing to large variability in the estimate.

^* Suppressed owing to small numbers.

^† A woman is deemed to have had screening mammography if her reason for undergoing a mammogram was one of the following: family history of breast cancer, regular check-up/routine screening, age, or current use of hormone replacement therapy.

^‡ All jurisdictions provided data in 2008 and 2012. Screening content was optional in 2009–11 and the following jurisdictions provided data: 2009: AB, NB, NS, NL, NT; 2010: AB, NB, NS, NL, NT; 2011: AB, ON, NL, NU.

Data source: Statistics Canada, Canadian Community Health Survey.

Data Table

Jurisdiction	Number of women having had screening mammograms	Percent (%)	Quality indicator	Lower bound of 95% confidence interval	Upper bound of 95% confidence interval
MB	5,401	7.0	E	2.8	11.2
QC	64,483	11.9	E	7.0	16.7
SK	9,175	14.7	E	7.7	21.7
NB	32,913	17.6		12.9	22.2
ON	387,308	18.3		15.6	21.0
BC	98,387	25.9		20.9	30.8
PE	3,306	26.9	E	14.0	39.7
NL	54,560	26.9		22.1	31.6
NS	66,382	27.4		22.1	32.8
AB	311,010	27.5		23.8	31.2
NT	2,296	27.6	E	17.9	37.3
YT	*	*	*	*	*
NU	*	*	*	*	*

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Figure 7.6

Proportion of self-reported screening mammograms^† performed on women within and outside the recommended target age (50-74) in the past year, jurisdictions combined^‡ — 2008, 2012 and 2014 reporting years

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^† A woman is deemed to have had a screening mammogram if her reason for undergoing a mammogram was one of the following: family history of breast cancer, regular check-up/routine screening, age or current use of hormone replacement therapy.

^‡ Includes NS, NB, AB and NT

The percentages might not sum up to 100% due to rounding methodology adopted by Statistics Canada.

Data source: Statistics Canada, Canadian Community Health Survey.

Data Table

Year	Age group	Number of women having had screening mammograms	Percent (%)	Lower bound of 95% confidence interval	Upper bound of 95% confidence interval
2008	75+	26,500	6.4	5.0	8.1
2008	50-74	265,500	64.0	59.0	68.0
2008	40-49	123,500	30.0	25.0	34.0
2012	75+	20,500	4.9	3.7	6.4
2012	50-74	304,250	73.0	68.0	78.0
2012	40-49	91,250	22.0	17.4	27.0
2014	75+	29,000	7.2	5.4	9.6
2014	50-74	296,600	74.0	68.0	78.0
2014	40-49	77,000	19.1	14.8	24.0

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Data specifications
Data specifications
Definition:

The percentage of all screening mammograms in the past year reported by women aged 40 – 49

Distribution of screening mammograms in the past year by age groups

Rationale for measurement: Screening mammography has been shown to reduce breast cancer morbidity and mortality associated with advanced cancer, but the evidence of benefit is strongest for women between the ages of 50 and 74. Reporting on mammograms performed outside of the recommended age range can help identify how mammogram screening practices across the country can become better aligned with best practice guidelines and recommendations, in order to avoid any unnecessary and potentially harmful interventions.

Measurement timeframe:

The percentage of all screening mammograms in the past year reported by women aged 40 – 49: years 2008-2012 combined

Distribution of screening mammograms in the past year by age groups: years 2008, 2012 and 2014

Denominator: The number of women reported having had a screening mammogram in the past year for asymptomatic reasons

Numerator:

The percentage of all screening mammograms in the past year reported by women aged 40 – 49:
The number of women aged 40-49 reporting having a screening mammogram in the past one year for asymptomatic reasons

Distribution of screening mammograms in the past year by age groups:
The number of women reporting having had a screening mammogram in the past one year for asymptomatic reasons, separated by age group:

40-49

50-74

75+

Exclusion criteria:

Women aged <40 were excluded

Women reporting having had a screening mammogram in the past year for symptomatic reasons were excluded

Data availability:

The percentage of all screening mammograms in the past year reported by women aged 40 – 49 by jurisdiction: All jurisdictions provided data in 2008 and 2012. Mammography module was optional from 2009 to 2011; the following jurisdictions provided data in 2009: AB, NB, NS, NL and NT; 2010: AB, NB, NS, NL and NT; 2011: AB, ON, NL and NU

Distribution of screening mammograms in the past year by age groups in 2008, 2012 and 2014 includes data from NS, NB, AB and NT

Stratification:

The percentage of all screening mammograms in the past year reported by women aged 40 – 49: by jurisdiction

Distribution of screening mammograms in the past year: by age group: 40-49, 50-74, 75+

Data source: Statistics Canada, Canadian Community Health Survey (CCHS)

Data retrieval date:

The percentage of all screening mammograms in the past year reported by women aged 40 – 49: January 2016

Distribution of screening mammograms in the past year: February 2018

Variables details: Not applicable

Notes from jurisdictions: Not applicable

Methodology notes:

Data were based on a representative sample and was extrapolated to the overall population.

Contents about woman breast cancer mammograms in survey questionnaire are optional, not all jurisdictions have data available across the years from 2008 to 2012

At jurisdiction level, data were pooled through 2008 to 2012 whenever data were available to get the most stable statistical measures of breast screening mammograms in the age 40 – 49;

Jurisdiction combined includes 4 provinces: NS, NB, AB and NT. These provinces have data available across the years (2008, 2012 and 2014) to reflect the time trend of breast screening mammograms by age group, especially for age groups outside of the guideline: 40-49 and 75+.

A woman is deemed to have had screening mammography due to asymptomatic reasons if she self-reported one of the following reasons: family history of breast cancer, regular check-up/routine screening, age, or current use of hormone replacement therapy. Any of the following reasons were not considered screening mammography for asymptomatic reasons: lump, follow-up to breast cancer treatment, breast problem or other.

Changes to definition compared to previous years: Not applicable
Related indicators

Related Indicators

Breast cancer screening

Participation rate in breast cancer screening programs (%), by jurisdiction – 2014 screening year

Show Target - Figure 2.2

View this indicator

Breast cancer diagnosis wait times

Median and 90^th percentile wait times for resolution of abnormal breast screen with tissue biopsy for asymptomatic women (aged 50–69), by jurisdiction — 2015 screening years

Show Target - Figure 3.2

View this indicator

Breast cancer

Incidence rates for breast cancer in women, by stage at diagnosis and province, age-standardized to the 2011 Canadian population — 2015 diagnosis year

View this indicator

Index

Breast cancer screening outside of guidelines

Charts and Tables

Figure 7.1

Percentage of self-reported screening mammograms performed in asymptomatic^† women within and outside the recommended target age range for screening in the past two years, by province/‌territory — 2012 reporting year

Figure

Data Table

Data Table

Figure 7.5

Percentage of all screening mammograms^† in the past year reported by women aged 40–49, by jurisdiction^‡ — 2008–12 reporting years combined

Figure

Data Table

Data Table

Figure 7.6

Proportion of self-reported screening mammograms^† performed on women within and outside the recommended target age (50-74) in the past year, jurisdictions combined^‡ — 2008, 2012 and 2014 reporting years

Figure

Data Table

Data Table

Data specifications

Other related sites:

Questions about cancer?

Index

Breast cancer screening outside of guidelines

Charts and Tables

Figure 7.1

Percentage of self-reported screening mammograms performed in asymptomatic† women within and outside the recommended target age range for screening in the past two years, by province/‌territory — 2012 reporting year

Figure

Data Table

Data Table

Figure 7.5

Percentage of all screening mammograms† in the past year reported by women aged 40–49, by jurisdiction‡ — 2008–12 reporting years combined

Figure

Data Table

Data Table

Figure 7.6

Proportion of self-reported screening mammograms† performed on women within and outside the recommended target age (50-74) in the past year, jurisdictions combined‡ — 2008, 2012 and 2014 reporting years

Figure

Data Table

Data Table

Data specifications

Related Indicators

Other related sites:

Questions about cancer?

Percentage of self-reported screening mammograms performed in asymptomatic^† women within and outside the recommended target age range for screening in the past two years, by province/‌territory — 2012 reporting year

Percentage of all screening mammograms^† in the past year reported by women aged 40–49, by jurisdiction^‡ — 2008–12 reporting years combined

Proportion of self-reported screening mammograms^† performed on women within and outside the recommended target age (50-74) in the past year, jurisdictions combined^‡ — 2008, 2012 and 2014 reporting years