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Table 5 Summary statistics on the estimated intake and hazard quotients (HQ) for all study children.a

From: Pesticides in house dust from urban and farmworker households in California: an observational measurement study

     

Select Summary Statistics for HQs based on

54 dust samples from farmworker and urban

children

Analyte

RfD

(mg/kg/dy)b

# samples

with

concentration

>LOD

Range of Intake

(mg/kg/day)c

p50

p75

p95

Max

Organophosphates

  

Min

Max

    

diazinon

0.0002

36

--

7.0 × 10-07

2.5 × 10-04

4.3 × 10-04

1.6 × 10-03

3.5 × 10-03

chlorpyrifos

0.00003

25

--

1.1 ×10-06

--

4.9 × 10-03

2.3 × 10-02

3.8 × 10-02

malathion

0.07

5

--

4.9 × 10-06

--

--

2.8 × 10-06

7.0 × 10-05

tetrachlorvinphos

0.04

4

--

1.5 × 10-06

--

--

2.2 × 10-05

3.9 × 10-05

Pyrethroids

        

cis-permethrind

0.25

54

5.4 × 10-08

1.3 × 10-04

9.7 × 10-06

2.0 × 10-05

8.4 × 10-05

5.1 × 10-04

trans-permethrind

0.25

54

8.6 × 10-08

2.2 × 10-04

1.7 × 10-05

3.2 × 10-05

1.6 × 10-04

8.9 × 10-04

cypermethrin

0.06

32

--

6.4 × 10-05

2.5 ×10-05

8.4 × 10-05

4.8 × 10-04

1.1 × 10-03

bifenthrin

0.015

15

--

1.1 × 10-05

--

4.4 × 10-06

2.6 × 10-05

7.5 × 10-04

sumithrin

0.0007

9

--

3.7 × 10-06

--

--

3.2 × 10-03

5.2 × 10-03

deltamethrin

0.0033

8

--

9.0 × 10-05

--

--

6.7 × 10-03

2.7 × 10-02

prallethrin

0.025

1

--

1.9 × 10-07

--

--

--

7.4 × 10-06

esfenvalerate

0.02

1

--

4.4 × 10-07

--

--

--

2.2 × 10-05

Others

        

chlorthal-dimethyl

0.01

28

--

1.8 × 10-07

3.0 × 10-06

7.2 × 10-06

1.5 × 10-05

1.8 × 10-05

piperonyl butoxide

0.16

49

--

2.2 × 10-04

5.0 × 10-06

1.7 × 10-05

2.5 × 10-04

1.4 × 10-03

  1. a. A hazard quotient (HQ) was calculated as the ratio of the potential dust intake to the respective analyte reference dose (RfD). The HQ was only calculated for those analytes for which an RfD was available. b. Chronic population adjusted doses (cPADs) were used as the reference dose for chlorpyrifos (cPAD for children and females 13-50 years of age) and deltamethrin. Sources: IRIS database http://cfpub.epa.gov/ncea/iris/index.cfm?fuseaction=iris.showSubstanceList and EPA's Pesticide Registration Status: http://www.epa.gov/opp00001/reregistration/status.htm. c. Intake was calculated by multiplying the toxicant dust concentration by an ingestion rate of 0.10 g/day (100 mg/day) then dividing by the child-specific body weight (kg). d. The RfD available for "permethrin" was used for each individual isomer in our calculations. Notation: '--' Value is not reported since dust concentrations were less than the limit of detection.