Table 4A.

Concentrations (Geometric Mean) and Detection Frequencies of Six Dialkylphosphate (DAP) Metabolites Detected in Child Urine in Lower Yakima Valley, WA. Farmworker (FW) and non-farmworker (NFW) urinary metabolite concentrations are in units of nmol DAP/milliliter urine.

Urinary Metabolite	Thinning Season				Harvest Season				Non-Spray Season
	Geometric				Geometric				Geometric
DMAP	n	% Detect	Mean	95% CI	n	% Detect	Mean	95% CI	n	% Detect	Mean	95% CI
FW	85	100%	0.205**	(0.031–1.341)	82	100%	0.231	(0.027–1.987)	78	100%	0.089	(0.011–0.709)
NFW	85	100%	0.100	(0.012–0.866)	88	100%	0.216	(0.018–2.597)	78	100%	0.113	(0.017–0.754)
	Geometric				Geometric				Geometric
DMP	n	% Detect	Mean	95% CI	n	% Detect	Mean	95% CI	n	% Detect	Mean	95% CI
FW	85	96%	0.045*	(0.005–0.434)	82	94%	0.030	(0.002–0.455)	78	83%	0.016	(0.001–0.188)
NFW	85	98%	0.030	(0.004–0.241)	88	92%	0.044	(0.003–0.705)	78	94%	0.031**	(0.003–0.309)
	Geometric				Geometric				Geometric
DMTP	n	% Detect	Mean	95% CI	n	% Detect	Mean	95% CI	n	% Detect	Mean	95% CI
FW	85	100%	0.120**	(0.017–0.861)	82	100%	0.155	(0.016–1.480)	78	100%	0.044	(0.005–0.352)
NFW	85	100%	0.050	(0.004–0.591)	88	100%	0.118	(0.010–1.416)	78	99%	0.050	(0.005–0.485)
	Geometric				Geometric				Geometric
DMDTP	n	% Detect	Mean	95% CI	n	% Detect	Mean	95% CI	n	% Detect	Mean	95% CI
FW	85	100%	0.015**	(0.001–0.157)	82	89%	0.008	(0.002-0.217)	78	90%	0.004	(0.001–0.047)
NFW	85	98%	0.005	(0.001–0.052)	88	98%	0.017*	(0.001–0.349)	78	97%	0.006	(0.001–0.043)
	Geometric				Geometric				Geometric
DEP+DETP	n	% Detect	Mean	95% CI	n	% Detect	Mean	95% CI	n	% Detect	Mean	95% CI
FW	85	100%	0.023	(0.003–0.164)	85	78%	0.008	(<0.001–0.193)	78	91%	0.013	(0.001–0.162)
NFW	85	100%	0.024	(0.012–0.866)	85	98%	0.020**	(0.003–0.160)	78	99%	0.025**	(0.003–0.185)
	Geometric				Geometric				Geometric
DEP	n	% Detect	Mean	95% CI	n	% Detect	Mean	95% CI	n	% Detect	Mean	95% CI
FW	85	94%	0.013	(0.001–0.199)	82	57%	0.004	(<0.001–0.121)	78	64%	0.004	(0.001–0.112)
NFW	85	98%	0.012	(0.001–0.200)	88	81%	0.008*	(0.001–0.156)	78	92%	0.014**	(0.001–0.212)
	Geometric				Geometric				Geometric
DETP	n	% Detect	Mean	95% CI	n	% Detect	Mean	95% CI	n	% Detect	Mean	95% CI
FW	85	98%	0.004	(0.001–0.024)	82	66%	0.002	(<0.001–0.037)	78	91%	0.004	(0.001–0.004)
NFW	85	96%	0.004	(0.001–0.025)	88	97%	0.006**	(0.001–0.048)	78	99%	0.005	(0.001–0.031)
DEDTP	Geometric				Geometric				Geometric
(not included in calculations)	n	% Detect	Mean	95% CI	n	% Detect	Mean	95% CI	n	% Detect	Mean	95% CI
FW	85	79%	0.001	(0.001–0.007)	82	39%	0.001	(<0.001–0.004)	78	49%	0.001	(<0.001–0.005)
NFW	85	92%	0.001	(0.001–0.004)	88	73%	0.001	(0.001–0.008)	78	86%	0.001	(0.001–0.007)

^“**”indicates significant difference at p<0.001 and

^“*”at p<0.05 between FW and NFW, based on Welch two-sample t-tests.