Table 1.

Questions regarding the intake of folic acid supplements

Question	Answering options
1. Have you been taking a daily	a. Yes
folic acid supplement because of the current pregnancy?	b. No
2. If yes: When did you begin taking a folic acid supplement?	a. …… weeks before stopping contraception
	b. At the same time as stopping contraception
	c. …… weeks after stopping contraception
	d. When I suspected that I might be pregnant
	e. When I knew for certain I was pregnant
	f. Other, …………