Table 3.

Erythrocyte and plasma folate concentrations by sociodemographic variables and fruit and vegetable intake

	Erythrocyte folate (nmol/L)				Plasma folate (nmol/L)
	n	Median	Q 1	Q 3	n	Median	Q 1	Q 3
All	282	460	419	540	294	14	10	19
Malea	124	480	424	559	127	13	10	18
Femalea	141	450	390	500	150	15	11	19
Female aged 18–44 y	61	440	380	481	66	14	11	18
		p (sex) = 0.007				p (sex) = 0.019
		p (female) = 0.070				p (female) = 0.380
Fruit and vegetable consumption
Fruit and vegetables <200 g/d	59	450	400	520	63	13	9.6	16
Fruit and vegetables 200–350 g/d	104	460	400	535	110	14	10	19
Fruit and vegetables 350–500 g/d	65	450	420	569	66	14	11	18
Fruit and vegetables >500 g/d	37	490	460	670	38	16.5	13	22
		p = 0.016				p = 0.009
Income
Income < median	133	460	419	530	137	13	10	17
Income ≥ median	146	465	420	550	154	14	11	19
		p = 0.260				p = 0.210
Level of education
Elementary school	26	445	420	540	30	12	9	17
High school	117	460	419	530	122	13	10	18
College or university	119	470	423	550	122	15	12	20
		p = 0.600				p = 0.370

The Wilcoxon–Mann–Whitney rank sum test was used to test if sex, age, income, fruit and vegetable consumption or low-energy reporting affected status. The Kruskal–Wallis test was used to compare if education level affected status

^aData on gender are missing for erythrocyte folate (n = 17) and plasma folate (n = 17)