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Comparing E links with N links
| N link | N non link | ||
| E link | a | b | PPV = a/(a+b) |
| E non link | c | d | NPV = d/(c+d) |
| Sensitivity = a/(a+c)) | Specificity = d/(b+d) |
Note: The number of non links depends on whether non links to hospital episodes or RAC events are being considered. Therefore the values of NPV and specificity are different depending on whether they are derived from the point of view of hospital discharges (86200 in total) or RAC entries (19600 in total).
