Table 2. Pearson correlation coefficients of the insulin-like growth factor system in Boyd Orr and CaPS.

	Correlation coefficient (p value)
	IGF-I	IGF-II	IGFBP-2*	IGFBP-3
IGF-II
Boyd Orr	0.39 (<0.001)
CaPS	0.27 (<0.001)
IGFBP-2 *
Boyd Orr	−0.19 (<0.001)	−0.28 (<0.001)
CaPS	-	-
IGFBP-3
Boyd Orr	0.57 (<0.001)	0.63 (<0.001)	−0.23 (<0.001)
CaPS	0.39 (<0.001)	0.34 (<0.001)	-
Insulin *
Boyd Orr	0.06 (0.3)	0.12 (0.021)	−0.44 (<0.001)	0.09 (0.09)
CaPS	−0.02 (0.7)	−0.01 (0.9)	-	0.03 (0.4)

The IGFs and insulin were standardized by: age, sex (Boyd Orr), sample storage time and lab technician (CaPS).

*IGFBP-2 and insulin were natural log transformed before standardization, due to skewed distributions; IGFBP-2 is only available in Boyd Orr.