Table 3.

Spearman correlation coefficients between Version 1 algorithm scores and measurements of post-application urine 2,4-D and chlorpyrifos and modeled post-application urine concentrations for 2,4-D (N = 88) and chlorpyrifos (N = 17) and Version 2 algorithm scores with post-application urine concentrations and modeled post-application urine concentrations for 2,4-D and chlorpyrifos.

	Algorithm
	Version 1	Version 2
2,4-D
Version 1	1
Version 2	0.95	1
Post-apply urine conc.	0.42	0.48
Predicted post-apply urine concentration 1	0.96	0.97
Chlorpyrifos 2
Version 1	1
Version 2	0.97	1
Post-apply urine conc.	0.53	0.52
Predicted post-apply urine concentration	0.52	0.59

¹ Modeled value from a non-linear regression mode l.

² TCPy measured as a urinary biomarker for chlorpyrifos.