Table 3.
Comparison of pre- and post-operative diagnosis of GC
| Casesa | Non-Casesa | Kappa (standard error) | |||
|---|---|---|---|---|---|
| True Positive N (%)b | False Negative N (%) | True Negative N (%)b | False Positive N (%) | ||
| Pre- AC versus post-operative diagnosis | 1747 (94%) | 117 (6%) | 3237 (96%) | 142 (4%) | 0.89 (0.01) |
| Pre- AC versus combination diagnosis | 1797 (85%) | 322 (15%) | 3032 (97%) | 92 (3%) | 0.83 (0.01) |
| Pre- CC versus post-operative diagnosis | 1602 (90%) | 173 (10%) | 3416 (98%) | 52 (2%) | 0.90 (0.01) |
| Pre-operative CC versus combination diagnosis | 1649 (34%) | 3188 (66%) | 401 (99%) | 5 (1%) | 0.07 (0.01) |
| Pre- GC versus post-operative diagnosis | 29 (15%) | 171 (85%) | 5039 (99%) | 4 (1%) | 0.24 (0.01) |
| Pre-operative GC versus combination diagnosis | 32 (9%) | 319 (91%) | 4891 (100%) | 1 (0%) | 0.16 (0.01) |
a
Cases and non-cases were determined using either the post-operative diagnosis, or using a combination of post-operative or pathology diagnoses.
b
Per cent true positive and per cent true negative are, respectively, equivalent to sensitivity and specificity of the pre-operative diagnoses.