Table 3.

Linear regression characteristics of fetal arterial hormones and fetal weights

Hormone	Pearson’s correlation (R)	R 2	P value	Slope	95% confidence interval
Insulin-like growth factor 1*
All animals	0.776	0.602	2.65 × 10−18	36.54	30.01–43.03
Control	0.360	0.130	8.81 × 10−3	22.98	6.05–39.91
IUGR	0.828	0.686	2.69 × 10−9	42.16	31.71–52.60
Insulin*
All animals	0.421	0.177	1.43 × 10−5	0.13	0.07–0.18
Control	− 0.127	0.016	0.3466	− 0.08	− 2.30 to 0.09
IUGR	0.410	0.168	7.80 × 10−3	0.06	0.02–0.10
Norepinephrine*
All animals	− 0.629	0.395	7.06 × 10−12	− 701.82	− 879.66 to − 523.98
Control	− 0.239	0.057	0.0703	− 212.78	− 443.75 to 18.20
IUGR	− 0.505	0.255	1.21 × 10−3	− 894.85	− 1411.16 to − 378.54
Cortisol
All animals	− 0.408	0.166	3.37 × 10−5	− 11.28	− 16.42 to − 6.14
Control	− 0.107	0.011	0.4228	− 3.72	− 12.96 to 5.51
IUGR	− 0.355	0.126	2.65 × 10−2	− 15.85	− 29.74 to − 1.96
Glucagon
All animals	− 0.373	0.139	4.31 × 10−3	− 19.62	− 32.83 to − 6.41
Control	− 0.136	0.018	0.4104	− 10.60	− 36.39 to 15.19
IUGR	− 0.366	0.025	0.1361	− 24.58	− 57.78 to 8.62

Pearson’s correlation was used to assess the correlation between fetal arterial hormone concentrations and fetal weight for all animals combined, just control animals, and just IUGR animals

^*A significant differences between the regression lines for control vs. IUGR animals (P = 0.0006, IGF-1; P = 0.0010, insulin; P = 0.0242, norepinephrine; P = 0.3279, cortisol; P = 0.1531, glucagon)