Regional variation in OBSP coverage, by LHIN, women aged 50-69, 2007 and 2008-2009
Coverage |
Target |
South West |
95% CI |
OBSP |
95% CI |
Women screened (n) |
|
61,212 |
|
636,511 |
|
Participation rate (%) |
≥ 70% |
52.2 |
51.8-52.6 |
42.0 |
41.9-42.1 |
Retention rate* (%) |
initial screens |
≥ 75% |
78.3 |
77.4-79.2 |
77.3 |
77.1-77.6 |
| rescreens |
≥ 90% |
90.1 |
89.7-90.5 |
88.3 |
88.2-88.5 |
Participation Rate - The percentage of screen-eligible Ontario women (50-69 years old) who have completed at least one screen in the OBSP in a two-year time period.
Retention Rate - The percentage of screen-eligible women who were rescreened within 30 months of their previous program screen for initial and subsequent screens.
Data Source: Integrated Client Management System, 2010
* Retention rate for women screened in 2007
|
Regional variation in OBSP follow-up, by LHIN, women aged 50-69, 2008
Follow-Up |
Target |
South West |
95% CI |
OBSP |
95% CI |
All screens (n) |
initial screens |
|
7,718 |
|
101,785 |
|
| rescreens |
|
28,612 |
|
260,783 |
|
Abnormal screens (n) |
initial screens |
|
1,375 |
|
12,769 |
|
| rescreens |
|
2,166 |
|
18,130 |
|
Abnormal call rate (%) |
initial screens |
< 10% |
17.8 |
16.9-18.8 |
12.5 |
12.3-12.8 |
| rescreens |
< 5% |
7.6 |
7.3-7.9 |
7.0 |
6.9-7.1 |
Diagnostic interval (%) (%) |
within 5 weeks without a tissue biopsy |
≥ 90% |
66.6 |
63.8-69.6 |
81.1 |
80.0-82.2 |
within 7 weeks with a tissue biopsy |
≥ 90% |
51.0 |
44.9-57.6 |
55.7 |
53.5-58.0 |
Abnormal Call Rate - The percentage of screens that are referred for further testing because of an abnormal result for initial and subsequent screens.
Diagnostic interval (%) - Duration (in weeks) from abnormal screen to diagnosis (benign or cancer) for initial and subsequent program screens combined.
Data Source: Integrated Client Management System, 2010
|
Regional variation in OBSP quality of screening, by LHIN, women aged 50-69, 2007 and 2008
Quality of Screening |
Target |
South West |
95% CI |
OBSP |
95% CI |
Abnormal screens (n) |
initial screens |
|
1,354 |
|
12,484 |
|
| rescreens |
|
2,142 |
|
17,860 |
|
Breast cancers (n) |
initial screens |
|
60 |
|
580 |
|
| rescreens |
|
127 |
|
1,098 |
|
Positive predictive value* (%) |
initial screens |
≥ 5% |
4.4 |
3.4-5.7 |
4.6 |
4.3-5.0 |
| rescreens |
≥ 6% |
5.9 |
4.9-7.1 |
6.1 |
5.8-6.5 |
One-year sensitivity** (%) |
|
90.1 |
77.4-100 |
88.1 |
83.8-92.6 |
One-year specificity** (%) |
|
91.2 |
90.1-92.2 |
92.2 |
91.9-92.6 |
Positive Predictive Value - The percentage of abnormal cases with completed follow-up found to have breast cancer (ductal carcinoma in situ [DCIS] or invasive) after diagnostic work-up for initial and subsequent program screens.
Sensitivity -The proportion of women diagnosed with a screen-detected DCIS and/or invasive breast cancer following completion of diagnostic assessment who had a positive screening test for breast cancer (for initial and subsequent program screens combined).
Specificity - The proportion of women without a diagnosis of DCIS and/or invasive breast cancer who had a negative screening test for breast cancer (for initial and subsequent program screens combined).
Data Source: Integrated Client Management System, 2010
Upper confidence limit was set to a maximum of 100
* Positive predictive values for women screened in 2008 ** Sensitivity and Specificity for women screened in 2007
|
Regional variation in OBSP detection, by LHIN, women aged 50-69, 2008
Detection |
Target |
South West |
95% CI |
OBSP |
95% CI |
All screens minus those screens with final results unknown (n) |
initial screens |
|
7,697 |
|
101,500 |
|
| rescreens |
|
28,588 |
|
260,513 |
|
Breast cancers (n) |
in situ initial |
|
11 |
|
92 |
|
| in situ rescreens |
|
23 |
|
182 |
|
| invasive initial |
|
49 |
|
488 |
|
| invasive rescreens |
|
104 |
|
916 |
|
In situ cancer detection rate (per 1,000 screens) |
initial screens |
|
1.4 |
0.7-2.6 |
0.9 |
0.7-1.1 |
| rescreens |
|
0.8 |
0.5-1.2 |
0.7 |
0.6-0.8 |
Invasive breast cancer detection rate (per 1,000 screens) |
initial screens |
> 5 |
6.4 |
4.7-8.4 |
4.8 |
4.4-5.3 |
| rescreens |
> 3 |
3.6 |
3.0-4.4 |
3.5 |
3.3-3.8 |
In Situ Breast Cancer Detection Rate - The number of women detected with DCIS breast cancer during a screening episode per 1,000 women screened for initial and subsequent program screens.
Invasive Breast Cancer Detection Rate - The number of women detected with invasive breast cancer during a screening episode per 1,000 women screened for initial and subsequent program screens.
Data Source: Integrated Client Management System, 2010
|
Regional variation in OBSP disease extent at diagnosis, by LHIN, women aged 50-69, 2008
Disease Extent at Diagnosis |
South West |
95% CI |
OBSP |
95% CI |
Invasive breast cancers with known TNM stage group (n) |
143 |
|
1,218 |
|
Stage I invasive breast cancer (%) |
55.2 |
43.7-68.9 |
62.2 |
57.9-66.8 |
Early Stage Invasive Breast Cancer Detection Rate - The percentage of invasive screen-detected breast cancers detected at an early stage
(TNM stage I) for initial and subsequent program screens combined.
Data Source: Integrated Client Management System, 2010
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