COITAL RATE AND PREGNANCY-INDUCED HYPERTENSION

Previous workers have emphasized the possibility that pregnancy-induce d hypertension (PIH) is associated with a change of sexual partner. It is noted here that any such association is far weaker than that betwe en PIH and fecundability (the probability of conceiving in a month at risk). This latter association is so strong as to suggest its closenes s to a true cause. Of the determinants of fecundability, coital rate s eems the most promising to pursue as a possible cause of PIH.