Table 2 Risk factors used in the present study for different exposure groups.

Risk factors	Units	Infants	Toddlers	Children	Teenagers	Adults
Age range	years	0 to < 0.583	0.583 to < 5	5 to < 12	12 to < 20	20 to 80
Skin surface area (SA)^a	cm²	3538	6561	11,550	18,038	20,441
Average time (AT)	day	210	1610	2555	2920	10,950
Exposure duration (ED)	year	0.583	4.417	7.0	8.0	60.0
Exposure frequency (EF)	day/year	365	365	365	365	365
Time of dermal exposure (ET)^b	hours/day	0.32	0.43	0.45	0.55	0.58
Unit conversion factor (CF)	L/cm³	0.001	0.001	0.001	0.001	0.001
Body weight (BW)^c	Kg	6.42	14.46	26.01	58.03	78.45
Fraction for lifetime cancer risk^d	-	0.007	0.055	0.088	0.100	0.750

^a Median values obtained from Tables 7–9 on page 7–41 of the Exposure Factors Handbook (USEPA 2011)⁶⁴.
^b Median values obtained from Tables 16–29 on page pp16-108) and Tables 16–36 on page 16–119 of the Exposure Factors Handbook (USEPA 2011)⁶⁴.
^c Median values obtained from Table 8 − 3 on page 8–12 of the Exposure Factors Handbook (USEPA 2011)⁶⁴.
^d Federal Contaminated Site Risk Assessment in Canada, Part V: Guidance on Human Health Detailed Quantitative Risk Assessment for Chemicals (Health Canada, 2010)⁶⁵.

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