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Criterion for positive test was not given
| The first 150 words of the full text of this article appear below. |
EDITOR
In their report on postcoital testing Oei et al applied
inappropriate trial methods to the use of a diagnostic rather than a
therapeutic procedure.1 Their interpretation was
consequently misleading and further invalidated by biased selectivity.
A diagnostic procedure cannot alter outcome, except by influencing the
choice of treatment specific to a diagnosis. Numerous treatments were applied non-specifically and inconsistently, invalidating study outcome. Intrauterine insemination was incorrectly described as specific for negative postcoital findings but is used equally, like in
vitro fertilisation, in couples who tested positive, although success
rates differ.
The only significant finding was that the sum frequency of more
than five different treatments used was slightly greater in tested
couples than in those not tested (54% versus 41%). Invasive investigations (hysterosalpingography, laparoscopy) were, however, apparently used less frequently in the tested group. Pregnancy rates were not significantly different between couples with
negative and positive tests, but