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Overall agreement of invasive and non-invasive histologies in participants of the Million Women Study
| NHSBSP | Total | ||
| ONS | Invasive | Non-invasive | |
| Invasive | 4,567 | 148 | 4,715 |
| Non-invasive | 54 | 1,117 | 1,171 |
| Total | 4,621 | 1,265 | 5,886 |
| Percentage agreement | 96.6% | ||
| Kappa statistic | 0.9 | ||
| Test for heterogeneity | |||
| X21 | 6.1 | ||
| p | 0.01 | ||
NHSBSP, National Health Service Breast Screening Programme; ONS, Office for National Statistics.
