As mentioned, many media outlets incorrectly reported that all the men in the study had cancer.the Press Association wire copy in their reporting. We contacted the Press Association, and the wire service subsequently told Full Fact it had updated its copy., wrote that, with the combined tests, 92% of positive results were true positives, and 94% of negatives were true negatives .
Full Fact asked the lead researcher, Professor Dmitry Pshezhetskiy from the UEA, about this discrepancy. He confirmed the abstract of the published paper was now being corrected to reflect the true numbers.also stated that “most of the 147 men in the study had a positive result for PSA” but this was incorrect as only 57 of them did.
It should also be noted that the study uses a small sample size of 147, and the numbers analysed using the statistical test appear to be even smaller with 101 participants included in the results table for the headline results. The authors told Full Fact that the sample size was big enough to reach statistical significance but that further studies were definitely required, and with a lower proportion of cancer patients.
People just read the headlines, not the small print
Following our investigation, corrections were made by the study authors, the Press Association and the Daily Mail.
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