Table 2.

Summary statistics for MeHg, LCPUFA Status among Cohort Mothers ( as measured in maternal serum)^* and BSID-II testing on the children

Variable	N	Mean	SD	Range
MeHg (measured in mothers hair in ppm)	229	5.7	3.7	0.2–18.5
Docosahexaenoic acid mg/ml (DHA)
28 weeks	216	0.19	0.06	0.07–0.40
Delivery	183	0.16	0.06	0.06–0.34
mean of 28 weeks and delivery	229	0.17	0.05	0.07–0.32
Arachidonic acid mg/ml (AA)
28 weeks	216	0.63	0.14	0.36–1.23
Delivery	184	0.60	0.15	0.33–1.22
mean of 28 weeks and delivery	229	0.61	0.13	0.37–1.07
Eicosapentaenoic acid mg/ml (EPA)
28 weeks	217	0.02	0.01	0.00–0.09
Delivery	182	0.02	0.01	0.00–0.06
mean of 28 weeks and delivery	229	0.02	0.01	0.00–0.05
Alpha-Linolenic acid mg/ml (ALA)
28 weeks	216	0.01	0.01	0.00–0.12
Delivery	185	0.01	0.01	0.00–0.08
mean of 28 weeks and delivery	229	0.01	0.00	0.00–0.05
Linoleic acid mg/ml (LA)
28 weeks	216	7.3	1.4	3.29–11.44
Delivery	185	6.7	1.37	2.94–10.15
mean of 28 weeks and delivery	229	7.0	1.22	3.73–9.78
AA/DHA ratio	229	3.7	0.86	1.75–7.09
Ω 3 (DHA, EPA, ALA mg/ml)	229	0.20	0.06	0.08–0.36
Ω 6 (AA, LA mg/ml)	229	7.61	1.28	4.10–10.77
Ω 6/ Ω 3 ratio	229	40.17	11.72	13.21–90.35
BSID-II MDI 9 months	229	102.7	9.8	64–150
BSID-II PDI 9 months	226	102.4	16.4	50–141
BSID-II MDI 30 months	225	86.1	9.1	56–115
BSID-II PDI 30 months	228	91.4	13.7	50–123

^*LCPUFAs were measured in maternal blood at 28 weeks and delivery, and the geometric mean of the two measurements of each LCUPFA was used in the analysis.

If a mother had a measurement at only one time point, the missing measurement was estimated as described in the text.

BSID-II = Bayley Scales of Infant Development II