. Author manuscript; available in PMC: 2021 Sep 15.

Published in final edited form as: Eur Child Adolesc Psychiatry. 2020 Sep 4;30(9):1449–1462. doi: 10.1007/s00787-020-01621-5

Table 4.

Odds ratios and 95% CI of the association between maternal serum Vitamin B12 (continuous, quintiles) and offspring ADHD

A. Vitamin B12 as a continuous variable
	Case (N=1026)	Control (N=1026)	Association with maternal serum Vitamin B12
Maternal Vitamin B12 levels (pmol/L)	Median	Median	Odds ratio (unadjusted) 95% CI	P-value	Odds ratio (adjusted^*) 95% CI	P-value
Log-transformed analysis	4.50	4.52	0.96 (0.79–1.16)	0.685	0.97 (0.79–1.18)	0.759
B. As a categorical variable
	Case (N=1026)	Control (N=1026)	Association with maternal serum Vitamin B12
Maternal Vitamin B12 (%) (pmol/L)	n (%)	n (%)	Odds ratio (unadjusted) 95% CI	P-value	Odds ratio (adjusted^*) 95% CI	P-value
Quintiles
< 20 (< 1.20)	202 (19.68)	202 (19.68)	0.96 (0.73–1.26)	0.771	0.96 (0.73–1.27)	0.803
20–39 (1.20–2.38)	219 (21.34)	205 (19.98)	1.02 (0.77–1.34)	0.883	1.03 (0.78–1.37)	0.802
40–59 (2.39–4.02)	206 (20.07)	205 (19.98)	0.95 (0.72–1.26)	0.758	0.98 (0.74–1.29)	0.892
60–79 (4.03–7.09)	184 (17.93)	208 (20.27)	0.84 (0.63–1.11)	0.236	0.87 (0.65–1.16)	0.360
≥80 (≥7.10)	215 (20.95)	206 (20.07)	Reference		Reference

Adjusted for maternal SES