Py. Robillard et al., ASSOCIATION OF PREGNANCY-INDUCED HYPERTENSION WITH DURATION OF SEXUALCOHABITATION BEFORE CONCEPTION, Lancet, 344(8928), 1994, pp. 973-975
Pregnancy-induced hypertension affects at least 10% of all pregnancies
. An association with first pregnancy or a change in paternity for sub
sequent pregnancies has been suggested. We studied the duration of sex
ual cohabitation with the father prior to conception and the incidence
of pregnancy-induced hypertension. During a five-month period, 1011 c
onsecutive women who delivered in an obstetric unit were interviewed a
bout paternity and duration of sexual cohabitation before conception.
Obstetric charts were abstracted to identify three groups: those with
pregnancy-induced hypertension, chronic hypertension, and normal blood
pressure. The incidence of pregnancy-induced hypertension was 11.9% a
mong primigravidae, 4.7% among same-paternity multigravidae, and 24.0%
among new-paternity multigravidae. For both primigravidae and multigr
avidae, length of sexual cohabitation before conception was inversely
related to the incidence of pregnancy-induced hypertension (p<0.0001).
Similar results were observed after control for race, education, mate
rnal age, marital status, and number of pregnancies. Pregnancy-induced
hypertension may be a problem of primipaternity rather than primigrav
idity. Furthermore, an extended duration of sexual cohabitation before
conception may protect against pregnancy-induced hypertension.