Table 4. Logistic regression results for the association between female placental size (weight, surface area and placental-to-birth-weight ratio) and mental health outcomes.

Behavior	Female Placental Weight (100g)					Female Placental Surface Area (10cm2)					Female Placental-to-Birth-Weight Ratio
	Unadjusted		Adjusteda			Unadjusted		Adjusteda			Unadjusted		Adjustedb
	OR	95% CI	n	OR	95% CI	OR	95% CI	n	OR	95% CI	OR	95% CI	n	OR	95% CI
8-y-olds Rutter (teacher report)
Probable psychiatric disturbance	.94	.86–1.02	3176	.91	.79–1.04	1.00	.98–1.01	3140	1.00	.97–1.02	.99	.95–1.03	3176	.97	.92–1.01
Antisocial disorder	1.03	.91–1.16	3176	.97	.80–1.20	1.01	.99–1.03	3140	1.01	.99–1.04	1.00	.95–1.06	3176	.98	.92–1.05
Neurotic disorder	.88	.77–.99	3176	.88	.72–1.10	.99	.97–1.02	3140	1.00	.96–1.02	.97	.92–1.03	3176	.96	.89–1.02
Inattention-hyperactivity	.92	.82–1.04	3185	.90	.75–1.1	.99	.97–1.01	3149	.99	.96–1.02	.98	.93–1.03	3185	.95	.90–1.02
Inattention	.98	.91–1.10	3187	1.01	.90–1.13	1.00	.99–1.01	3151	1.01	.99–1.03	1.02	.99–1.10	3187	1.00	.96–1.04
Hyperactivity	1.07	.93–1.24	3189	.95	.76–1.19	1.00	.97–1.03	3153	.99	.95–1.03	.99	.93–1.06	3189	.98	.90–1.06
16-y-olds SWAN (parent report)
Combined ADHD	.99	.86–1.15	2779	.92	.74–1.15	1.01	.98–1.04	2745	1.01	.98–1.05	.99	.93–1.05	2779	.97	.90–1.05
Inattention	1.09	.94–1.27	2737	1.20	.95–1.50	1.01	.98–1.04	2702	1.02	.98–1.06	1.05	.98–1.11	2737	1.06	.98–1.14
Hyperactivity-impulsivity	.94	.81–1.10	2725	.91	.73–1.15	1.00	.97–1.03	2690	1.01	.98–1.05	.98	.92–1.05	2725	.96	.89–1.04

^aadjusted for gestational age, birth weight, socio-demographic factors (maternal age, family structure, education and social class) and medical factors (smoking during pregnancy, parity, pre-pregnancy BMI and gestational weight gain).

^badjusted as above, except for birth weight.