Table 2.

Fetal biometric measures at E18.5 in P0^+/+ and P0^+/- mice.

	P0+/+ vehicle	P0+/+ melatonin	P0+/- vehicle	P0+/- melatonin
Crown:rump length (mm)	28.8 ± 0.3	28.6 ± 0.2	27.4 ± 0.3a,b	26.7 ± 0.3a,b
Abdominal circumference (mm)	26.4 ± 0.5	26.9 ± 0.4	23.6 ± 0.4a,b	24.6 ± 0.3a,b,c
Head circumference (mm)	25.1 ± 0.4	25.1 ± 0.1	24.8 ± 0.3	24.9 ± 0.2

Number of litters as follows; P0^+/+ vehicle N = 10, P0^+/+ melatonin N = 11, P0^+/- vehicle N = 10, P0^+/- melatonin N = 11. ^aP < 0.001 compared with P0^+/+ vehicle, ^bP < 0.001 compared with P0^+/+ melatonin, ^cP < 0.05 compared with P0^+/- vehicle, generalized linear mixed models with sequential Sidak post-test.