Table 4
Sensitivity (true positives) and specificity (true negatives) of non-registry-based in relation to registry-based linkage results, Manitoba and Ontario, 2006/2007

Manitoba
Registry (gold standard)
Linked to DAD
Table summary
This table displays the results of Registry (gold standard)
Linked to DAD. The information is grouped by Non-registry
Linked to DAD (appearing as row headers), Yes, No and Total (appearing as column headers).
Non-registry
Linked to DAD		 Yes No Total
Yes a = true positive
28,428		 b = false positive
2,848		 31,276
No c = false negative
3,898		 d = true negative
243,763		 247,661
Total 32,326 246,611 278,937
Sensitivity a/(a+c) = 87.9% (% true positives)
Specificity d/(b+d) = 98.8% (% true negatives)
Ontario
Registry (gold standard)
Linked to DAD
Table summary
This table displays the results of Registry (gold standard)
Linked to DAD. The information is grouped by Non-registry
Linked to DAD (appearing as row headers), Yes, No and Total (appearing as column headers).
Non-registry
Linked to DAD		 Yes No Total
Yes a = true positive
106,968		 b = false positive
9,366		 116,334
No c = false negative
12,712		 d = true negative
2,258,865		 2,271,577
Total 119,680 2,268,231 2,387,911
Sensitivity a/(a+c) = 89.4% (% true positives)
Specificity d/(b+d) = 99.6% (% true negatives)
Sources: Registry and non-registry census-linked 2006/2007 Discharge Abstract Database (DAD).
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