. 2015 Feb 5;123(5):475–483. doi: 10.1289/ehp.1408197

Table 4.

Percentiles of FCCR-based exposure estimates (nmol OPs/day) for participants who were selected for urinary metabolite analysis.

	n	Percentile of FCCR-based exposure estimates
	n	10th	25th	50th	75th	90th
Subgroups selected for urinary metabolite comparison, conventional consumers^a
Random sample^b
Tertile 1	80	0.3	0.5	1.0	1.5	1.7
Tertile 2	79^c	2.1	2.4	3.2	3.9	4.6
Tertile 3	80	5.2	6.0	7.5	10.7	13.0
Demographically matched sample^d
Tertile 1	80	0.5	0.9	1.1	1.6	1.7
Tertile 2	80	2.3	2.5	3.2	4.0	4.6
Tertile 3	80	5.5	5.9	7.2	9.4	12.3
Subgroups selected for urinary metabolite comparison, by organic produce consumption habits^e
“Rarely or never”	80	5.9	6.9	9.1	11.3	13.8
“Sometimes”	80	6.0	7.0	9.0	11.4	13.8
“Often or always”	80	6.1	6.9	8.9	11.6	13.8
^aComparisons among conventional consumers are across tertiles of estimated dietary exposure to OPs. The lowest tertile (tertile 1) includes individuals with estimated exposures of < 1.8 nmol/day; the middle tertile (tertile 2) includes individuals with estimated exposures ranging from 1.8 to 4.7 nmol/day; and the highest tertile (tertile 3) includes individuals with estimated exposures > 4.7 nmol/day. ^bEighty participants were randomly selected from each tertile of predicted exposure. ^cOne participant was excluded because of an implausibly high urinary DAP measurement (> 30,000 nmol DAP/g creatinine). ^dParticipants were selected to provide three groups of 80 participants with similar frequencies of relevant demographic characteristics. ^eParticipants were selected to provide three groups who were intentionally matched on FCCR-based exposure estimate (a metric of produce intake weighted by frequency and magnitude of OP residues detected in each food item). This is reflected in the similar values across the percentiles of exposure.