The objective of this study was to determine whether there was a placebo response to clinic attendance in couples with prolonged (greater than 4 years) subfertility. From 4 to 18 years of subfertility we observed a treatment independent cumulative conception rate of 22%, which was independent of the length of subfertility. Twenty-seven women conceived after 1 to 4 years' subfertility, and 30 conceived after greater than 4 years' subfertility. The fecundity of the latter group was significantly greater than that of women with 1 to 4 years' subfertility, being similar to "normal" subjects who had stopped contraception. This study demonstrates that a subgroup of apparently normal women with greater than 4 years' subfertility responded positively to clinic attendance independent of any investigation(s) or therapy.
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