The association of risky drinking patterns prior to pregnancy with changes in these patterns during pregnancy.

a Adjusted for highest education attained, area of residence, private health insurance.
b Adjusted for partner status, violent relationship with a partner (ever).
c Adjusted for illicit drug use (ever), smoking (ever).
d Adjusted for previous live births.
e Adjusted for highest education attained, area of residence, private health insurance, partner status, violent relationship with a partner (ever), illicit drug use (ever), smoking (ever), and previous live births.