Table 4B.

Concentrations (Geometric Mean) and Detection Frequencies of Six Dialkylphosphate (DAP) Metabolites Detected in Adult 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%	0.656**	(0.050–8.718)	82	100%	0.690**	(0.037–12.824)	78	100%	0.082	(0.012–0.552)
NFW	86	100%	0.076	(0.016–0.355)	88	100%	0.246	(0.012–4.976)	79	100%	0.092	(0.019–0.456)
	Geometric				Geometric				Geometric
DMP	n	% Detect	Mean	95% CI	n	% Detect	Mean	95% CI	n	% Detect	Mean	95% CI
FW	85	98%	0.107**	(0.008–1.492)	82	98%	0.075*	(0.002–2.511)	78	73%	0.012	(0.001–0.166)
NFW	86	97%	0.019	(0.003–0.135)	88	91%	0.047	(0.002–0.927)	79	95%	0.024**	(0.003–0.215)
	Geometric				Geometric				Geometric
DMTP	n	% Detect	Mean	95% CI	n	% Detect	Mean	95% CI	n	% Detect	Mean	95% CI
FW	85	100%	0.433**	(0.027–7.548)	82	100%	0.472**	(0.023–9.873)	78	100%	0.048	(0.008–0.289)
NFW	86	100%	0.037	(0.006–0.220)	88	100%	0.131	(0.005–3.504)	79	100%	0.043	(0.008–0.289)
	Geometric				Geometric				Geometric
DMDTP	n	% Detect	Mean	95% CI	n	% Detect	Mean	95% CI	n	% Detect	Mean	95% CI
FW	85	100%	0.038**	(0.003–0.570)	82	90%	0.021	(0.001–1.561)	78	95%	0.003	(0.001–0.040)
NFW	86	100%	0.005	(0.001–0.031)	88	98%	0.020	(0.001–0.602)	79	97%	0.004	(0.001–0.026)
	Geometric				Geometric				Geometric
DEP+DETP	n	% Detect	Mean	95% CI	n	% Detect	Mean	95% CI	n	% Detect	Mean	95% CI
FW	85	99%	0.025	(0.003–0.127)	82	82%	0.011*	(0.001–0.240)	78	95%	0.011	(0.001–0.112)
NFW	86	100%	0.020	(0.003–0.133)	88	92%	0.018	(0.001–0.265)	79	99%	0.022**	(0.003–0.177)
	Geometric				Geometric				Geometric
DEP	n	% Detect	Mean	95% CI	n	% Detect	Mean	95% CI	n	% Detect	Mean	95% CI
FW	85	93%	0.012	(0.001–0.212)	82	63%	0.004	(<0.001–0.163)	78	64%	0.003	(<0.001–0.071)
NFW	86	93%	0.011	(0.001–0.173)	88	74%	0.007	(0.001–0.226)	79	86%	0.011**	(0.001–0.201)
	Geometric				Geometric				Geometric
DETP	n	% Detect	Mean	95% CI	n	% Detect	Mean	95% CI	n	% Detect	Mean	95% CI
FW	85	95%	0.005*	(0.001–0.045)	82	71%	0.002	(<0.001–0.055)	78	94%	0.004	(0.001–0.041)
NFW	86	99%	0.004	(0.001–0.022)	88	91%	0.005**	(0.001–0.075)	79	99%	0.004	(0.001–0.029)
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	84%	0.001	(0.001–0.007)	82	49%	0.001	(<0.001–0.003)	78	55%	0.001	(<0.001 –0.005)
NFW	86	91%	0.001	(0.001–0.006)	88	80%	0.001	(0.001–0.010)	79	84%	0.001	(0.001–0.008)

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

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