Table 5.

Crude and adjusted linear coefficients for maternal report of supplement use and plasma levels of folate, no supplement use as reference, N=2911.

		Model 1			Model 2a)			Model 3b)
	N	B	95 % CI		B	95 % CI		B	95 % CI
Week 13 to 17
Other supplements only	634	.922	.14	1.69	0.335	-0.45	1.12	-.246	-1.08	0.59
Folic acid only	211	7.549	6.37	8.71	6.879	5.69	8.06	6.744	5.52	7.96
Folic acid plus	947	7.425	6.73	8.11	6.657	5.94	7.36	5.580	4.76	6.39
Week 9 to 12
Other supplements only	234	0.015	-1.16	1.10	-0.115	-1.30	1.07	-1.209	-2.43	0.01
Folic acid only	512	1.348	.47	2.22	0.805	-0.08	1.69	-0.405	-1.34	0.53
Folic acid plus	942	4.459	3.74	5.17	3.686	2.93	4.43	0.238	-0.77	1.24
Week -4 to 8
Other supplements only	267	2.772	1.65	3.89	2.491	1.36	3.61	2.309	1.15	3.45
Folic acid only	526	2.975	2.11	3.84	2.406	1.52	3.28	1.556	0.62	2.48
Folic acid plus	938	5.006	4.28	5.72	4.294	3.54	5.03	2.291	1.33	3.25

Supplement use pattern are included as dummies. Linear regression was used to determine the coefficients for folate plasma levels (subjects with no supplement use in the relevant period as reference, B=0). Missing was excluded pairwise.

^a)Adjusted for education, age, planned pregnancy, BMI and smoking.

^b)Adjusted for education, age, planned pregnancy, BMI, smoking, and the other windows of supplement use (w 9-12 and w -4-8; w 13-17 and w -4-8; w 13-17 and w 9-12).