. 2012 May 4;153(7):3457–3467. doi: 10.1210/en.2011-1921

Table 2.

Litter size and fetal and placental weight

	Age	Litters	Maternal weight gain (g)	Litter size	Placental weight (mg)	Fetal weight (mg)	F:P ratio
FB	15.5	6	13.7 ± 2.1^a	10.0 ± 2.4^a	97.5 ± 7.7^a	472.0 ± 55.3^a	4.9 ± 0.4^a
IVF	15.5	5	14.4 ± 3.3^a	9.8 ± 2.3^a	106.9 ± 13.9^a	394.4 ± 35.5^b	3.9 ± 0.5^b
FB	18.5	16	20.6 ± 5.4^a	6.1 ± 2.7^a	101.5 ± 11.1^a	1491 ± 104.4^a	15.0 ± 1.6^a
IVF	18.5	14	22.0 ± 3.9^a	7.2 ± 2.0^a	127.3 ± 16.7^b	1360 ± 106.2^b	11.2 ± 1.3^b
FB	Birth	5	22.9 ± 5.4^a	8.0 ± 1.4^a		1710 ± 85.7^a
IVF	Birth	4	16.8 ± 4.7^a	6.3 ± 2.2^a		1766 ± 119.2^a

^a,b

Significantly different values (P < 0.05). Different superscripts if P < 0.05.