Table 1. Demographic, socioeconomic and lifestyle correlates of dietary supplement use in pregnant women of the NutriNet-Santé cohort study.

	All Pregnant		Supplement		Supplement		Age adjusted logistic
	women		Non-Users		Users1		regression analyses
	(n = 903)		(n = 317)		(n = 586)
	n	%	n	%	n	%	OR	P2
Age3	31.7	4.07	31.1	4.22	32.1	3.94	1.06 [1.02–1.10]	0.001
Geographical region								0.0007
Paris metropolitan area	198	21.9	46	14.5	152	25.9	1.00
North	66	7.3	33	10.4	33	5.6	0.26 [0.09–0.77]
North-West	142	15.7	48	15.1	94	16.0	0.61 [0.38–0.99]
Center	225	24.9	76	24.0	149	25.4	0.61 [0.40–0.95]
South-West	71	7.9	27	8.5	44	7.5	0.52 [0.29–0.93]
North-East	97	10.7	37	11.7	60	10.2	0.52 [0.31–0.89]
South-East	89	9.9	42	13.2	47	8.0	0.35 [0.20–0.59]
Corsica & overseas depts/territories	15	1.7	8	2.5	7	1.2	0.26 [0.09–0.77]
Marital Status								0.6
Married or living with partner	847	93.8	295	93.1	552	94.2	1.00
Single	56	6.2	22	6.9	34	5.8	0.84 [0.48–1.48]
Number of children
0	518	57.4	171	53.9	347	59.2	1.00	0.003
1	262	29.0	97	30.6	165	28.2	0.70 [0.50–0.97]
2 & more	123	13.6	49	15.5	74	12.6	0.52 [0.34–0.82]
Education								0.4
<12 years of schooling	37	4.1	16	5.0	21	3.6	1.00
> = 12 years of schooling	866	95.9	301	95.0	565	96.4	1.32 [0.67–2.60]
Income (€/month)
<1670	71	7.9	35	11.0	36	6.1	1.00	0.0004
1670–3130	328	36.3	134	42.3	194	33.1	1.35 [0.81–2.27]
>3130	504	55.8	148	46.7	356	60.8	2.09 [1.25–3.50]
Socioprofessional category								0.008
Executive and intellectual professions	322	35.7	94	29.7	228	38.9	1.00
Intermediate professions	253	28.0	79	24.9	174	29.7	0.96 [0.67–1.39]
Employees	280	31.0	119	37.5	161	27.5	0.61 [0.43–0.87]
Manual workers, farmers and self-employed	28	3.1	14	4.4	14	2.4	0.42 [0.19–0.92]
Never employed	20	2.2	11	3.5	9	1.5	0.45 [0.17–1.16]
Knowledge of official nutritional recommendations4								0.1
Poor (0–2)	191	21.2	78	22.9	113	19.0	1.00
Average (3)	217	24.0	73	23.2	144	25.1	1.35 [0.90–2.02]
Good (4–5)	495	54.8	166	53.9	329	55.9	1.34 [0.94–1.89]
Organic food consumption5								0.2
Never (avoid organic products)	191	25.5	79	29.7	112	23.2	1.00
Indifferent to organic food	88	11.7	32	12.0	56	11.6	1.18 [0.70–2.00]
Occasional consumption	239	31.9	75	28.2	164	34.0	1.53 [1.03–2.28]
Regular consumption	231	30.8	80	30.1	151	31.3	1.37 [0.92–2.05]

¹Dietary supplement users were defined as the subjects who used dietary supplement(s) at least 3 days a week at the time of the DS questionnaire.

²P for linear trend (with adjustment for age, number of children, income, and knowledge of nutritional recommendations) or overall P (for all other variables).

³Values are n % for all variables except for age where values are mean SD.

⁴From the French National Nutrition and Health Programme.

⁵Determined by multiple correspondence analysis of data from a questionnaire on organic food consumption (5 clusters defined by the first 3 discriminant axes). Because of missing values, the proportions of subjects were calculated with 483 supplement users and 266 non-users.