Associations between health professional input and change in health behaviours before pregnancy and folic acid consumption.

1Adjusted for age, ethnicity, education, previous live birth, medications, previous miscarriage/stillbirth, and LMUP score.1. 经年龄、种族、受教育程度、既往活产史、用药情况、既往流产/死胎史及LMUP评分（LMUP score）校正。