Coefficients of variation (CV) for the 26 laboratories who returned data for progesterone receptors (PR) on a minimum of 100 cases
| CV for PR according to patient age range (years) | ||||||||
|---|---|---|---|---|---|---|---|---|
| N | 31–45 | 46–50 | 51–55 | 56–65 | 66–75 | >75 | All ages | |
| One laboratory participating in this survey that provided data on PR did not participate in the UK NEQAS-ICC for hormonal receptors during the period in which receptor data were collected. The data from this laboratory were therefore not included in any of the analyses involving immunohistochemical assay sensitivity. | ||||||||
| All laboratories | 26 | 28.7% | 25.8% | 29.2% | 28.6% | 31.4% | 35.9% | 23.1% |
| Laboratories with high assay sensitivity | 18 | 27.5% | 23.0% | 22.8% | 25.0% | 32.3% | 31.8% | 20.1% |
| Laboratories with low assay sensitivity | 7 | 28.2% | 32.7% | 37.5% | 38.5% | 28.0% | 46.4% | 28.4% |