Table 1.

Correlation coefficients^* between IGF-related factors in plasma among controls (N=545^†) at baseline, Physicians’ Health Study, 1982–1984.

	Acid-labile subunit	Free IGF1	Total IGF1	IGFBP3	Age
Acid-labile subunit	1.0
Free IGF1	0.36	1.0
Total IGF1	0.58	0.39	1.0
IGFBP3	0.68	0.23	0.67	1.0
Age	−0.28	−0.09	−0.32	−0.22	1.0

^*P-values for Pearson correlations between IGF components were <0.001, and for correlations between IGF components and age were <0.05.

^†Data on free IGF1 was available for 538 controls