Table 3.
Kappa statistics values for test comparisons and interpretation for all cats and for clinical case cats
| FeLV test comparison | Kappa value for all cats (n=51) | Kappa value for clinical cases (n=16) |
|---|---|---|
| IFA blood and PCR blood | 1 | 1 |
| IFA blood and PCR bone marrow | 1 | 1 |
| PCR blood and PCR bone marrow | 1 | 1 |
| ELISA and IFA blood | 0.84 | 0.77 |
| ELISA and PCR blood | 0.83 | 0.76 |
| ELISA and PCR bone marrow | 0.83 | 0.76 |
| IFA blood and IFA bone marrow | 0.81 | 0.47 |
| IFA bone marrow and PCR blood | 0.81 | 0.42 |
| IFA bone marrow and PCR bone marrow | 0.81 | 0.42 |
| ELISA and IFA bone marrow | 0.69 | 0.29 |
| Kappa statistic interpretation a Kappa value | Strength of agreement | |
| 0 | No better than chance | |
| 0.01–0.20 | Slight | |
| 0.21–0.40 | Fair | |
| 0.41–0.60 | Moderate | |
| 0.61–0.80 | Substantial | |
| 0.81–0.99 | Almost perfect | |
| 1 | Perfect | |
ELISA=enzyme-linked immunosorbent assay; IFA=immunofluorescent antibody; PCR=polymerase chain reaction.
a
, see Holton et al (1998).